A substance that stimulates an immune response. The immune system recognizes these substances as being foreign, and produces antibodies to "fight" them. This antigen/antibody response is an important part of immunity.
a foreign substance, such as germs, that enter the body and lead to the formation of antibodies by the white blood cells.
chemical substance, foreign to the body, that causes the body's immune system to react by producing antibodies.
A foreign substance that causes the immune system to make a specific immune response.
A foreign macromolecule that does not belong to the host organism and that elicits an immune response.
any substance (usually a protein or carbohydrate) that induces the production of antibodies by immune cells. Usually is a substance that is "foreign" to the host.
A substance, usually a protein, that causes the formation of an antibody and reacts specifically with that antibody.
Any substance, which can generate the formation of a specific antibody (a protein created by the immune system to protect the body). For vaccines, the term antigen refers to a vaccine component that induces protection for one single disease (e.g., the measles antigen induces protection against measles).
Any molecule that is specifically recognized by an antibody or a T cell.
A protein coat on the surface of red blood cells; a red blood cell may have a protein coat of type A, B, or AB. If the cell has no antigens, it is called type O. The presence of a foreign antigen in a body will cause blood to clot.
a molecule such as a protein that elicits an immune response in the body.
a large molecule or small organism, such as the strep throat bacterium, whose entry into the body provokes an immune-system response.
a foreign substance in the body (toxins, bacteria, virus, ect) that causes antibodies to be made
A foreign body that the body's immune system identifies as potentially harmful, resulting in the production of antibodies to fight it. A virus is considered an antigen.
any substance that when introduced into the tissues or blood induces the formation of antibodies and reacts only with its specific antibodies
Any substance which is capable, under certain conditions, of inducing a specific immune response and of reacting with the products of that response, specific antibodies and/or t-lymphocytes.
Substance, usually a protein, that when introduced into the body causes the body to make an antibody, usually specific to the antigen.
An antigen is any substance that the body identifies as potentially dangerous and against which it produces a defence (an antibody).
Any molecule that elicits an antibody response.
A protein or carbohydrate that the body regards as foreign and thus is capable of stimulating an immune response.
A substance (protein, polysaccharide, glycolipid, tissue transplant, etc.) that is capable of inducing specific immune response.
Substance that evokes a response from the body's immune system, resulting in the production of antibodies or other defensive action by white blood cells.
Foreign (nonself) substance to which lymphocytes respond.
Usually a protein found on the surface of the virus that stimulates the immune response, especially the production of antibodies.
structure that is recognizedby an antibody. ABO blood types in humans are determined by the structure of carbohydrates that are attached to cell surface proteinson blood cells.
anti-, against + gen, producer] (n) a substance that, when introduced into the body, induces an immune response consisting of the production of a circulating antibody
any agent or substance (e.g., microorganisms or the substances they produce) that stimulates an immune response.
(also immunogen) any substance that can induce the immune system to mount an immune response, which can be of cellular nature, or as immunoglobin production as seen in bacterial infections and allergic reactions. At first exposure to an antigen, the immune system may not react but will be primed and 'remember' the antigen. The second encounter is usually more vigorous and can lead to anaphylaxis.[close window
(an´ ti jun) • Any substance that stimulates the production of an antibody or antibodies in the body of a vertebrate.
any molecule, usually a protein or polysaccharide, that can be identified as foreign or nonself. It may be a toxin, or a part of the protein coat of a virus, or a molecule unique to the plasma membranes.
Any foreign substance (self - non-self discrimination), such as virus, bacterium, or protein. After introduction into an organism, the antigenic substances elicit an immune response by stimulating the production of specific antibodies.
(AN tih jen): An invader the immune system recognizes as harmful.
a protein marker on the cell surface that is an indicator of "self" versus "non-self" and can stimulate the production of antibodies. Each antibody has a unique ability to bind antigen, triggering an immune response.
"Complex foreign molecules on microbes recognized by antibodies."
The chemical on a foreign agent such as an infectious bacterium or virus. Specialized lymphocytes recognize this chemical as being foreign and produce antibodies against that antigen. Cancer cells are thought to be weakly antigenic and thus should cause an immune response leading to their destruction.
any substance which the body identifies as potentially dangerous, e.g. a virus or bacterium. Its presence stimulates the body to produce antibodies.
Any piece of a substance (foreign protein, toxin, bacteria) that can induce a specific immune response or react to a specific antibody or T-cell.
Molecule that provokes an immune response.
"foreign" material introduced into the body (a virus or bacterium, for example) or other material which the immune system considers to be "foreign" because it is not part of the body's normal biology (e.g., prostate cancer cells); a substance that elicits a cellular-level immune response or causes the formation of an antibody
A foreign substance that causes your immune system to create an antibody or cells that will, in turn, attack the foreign substance.
Any foreign molecule that stimulates an immune response in a vertebrate organism. Many antigens are proteins such as the surface proteins of foreign organisms.
any substance that induces a response from the body's immune system; often a fragment of a virus or bacteria or some other substance that the body views as an invader
Substance, often in protein form, that the body's immune system will react to by producing antibodies.
Any substance that stimulates a response from the immune system.
a foreign determinant which is capable, when introduced into the body, of eliciting an immune response in normal subjects. This immune response may be humoral (i.e. leading to the production of antibodies) or cell-mediated (i.e. involving the activation of T lymphocytes*).
Any substance recognized as “foreign” by the immune system. In certain disorders, such as rheumatoid arthritis, the immune system mistakenly targets healthy body cells as foreign.– See also Antibody
A high-molecular-weight substance (usually protein) which, when foreign to the bloodstream of an animal, stimulates formation of a specific antibody.
A substance that interacts with a T cell receptor or an immunoglobulin (Lecture: Acquired Immunity, 2/14/02)
A foreign molecule (antigen) triggering the production of an antibody (also called immunoglobulin) by the immune system of an organism.
A substances that is capable, under appropriate conditions, of stimulating the body's immune system to react (e.g., against cancer cells).
A substance that sets off an "alarm" in the body to protect itself.
a substance present on our white blood cells that has the capacity to trigger an immune response.
The substance (usually a protein) that elicits antibody production in animals. Antigens are also known as immunogens.
any substance which can elicit in a vertebrate host the formation of specific antibodies or the generation of a specific population of lymphocytes reactive with the substance. Antigens are protein or carbohydrate, lipid or nucleic acid, or contain elements of all or any of these as well as organic or inorganic chemical groups attached to protein or other macromolecule. Whether a material is an antigen in a particular host depends on whether the material is foreign to the host and also on the genetic makeup of the host, as well as on the dose and physical state of the antigen.
A substance, usually a protein that the body perceives as foreign.
Substance or a structural part of a substance which causes the immune system to produce specific antibody or specific cells and which combines with specific binding sites (epitopes) on the antibody or cells. After Nagel et al. (eds), 1991 RT antibody, epitope.
A foreign substance, such as a fragment of a virus or bacteria, that stimulates the immune system to make antibodies.
Substance on the surface of body cells which is specific and unique to that individual.
A protein or carbohydrate substance that is recognized by the body as foreign that stimulates an immune response.
Substance that reacts to antibodies
A molecule whose shape triggers the production of antibodies ( immunoglobulins) that will bind to the antigen. A foreign substance capable of triggering an immune response in an organism.
Substances that are capable of causing the production of antibodies. Antigens may or may not lead to an allergic reaction.
A chemical recognized by the body's immune system as being foreign and against which it will form antibodies.
Any substance that has the capacity to induce an immune response
A molecule that is capable of stimulating production of an antibody in the body, usually a foreign and potentially toxic molecule
Any substance which, when introduced into the body, produces an immune reaction. Pathogenic bacteria and pollens are amongst the most common antigens.
a foreign substance (often a protein or carbohydrate) cabaple of inducing an immune reaction
any substance that causes a reaction by the immune system.
Substance that stimulates the production of an antibody to which it subsequently binds.
a 'foreign body' which stimulates the immune system e.g. bacteria, viruses, foreign proteins etc.
any substnace that induces the formation of an antibody
Antigens are substances that are recognised by the immune system. Very often these are proteins which are either on or in a cell or which are secreted by a tumour cell.
Any substance that the body regards as foreign. When introduced into the body, and antigen causes the immune system to produce a corresponding antibody to fight it.
Any substance or molecule that is recognized by the body as "foreign" and that stimulates a specific immune response when it enters the tissues of an organism.
Virus coded cell surface antigens that appear soon after the infection of a cell by virus, but before virus replication has begun.
Something the immune system recognises as foreign. An antigenic determinant is the small part, of a larger foreign target, which is actually recognised.
A marker on the surface of a cellthat can stimulate production of an antibody. With immuno therapies forcancer, the antibody targets the antigen on the cancer cell to kill that cell.
Substance which can stimulate the production of antibodies.
any substance (as a toxin or enzyme) that stimulates the production of antibodies
a chemical feature (a protein) which is unique to any given type of invading organism
a component of an organism which evokes an immune response
a foreign agent with the capacity to stimulate an immune response in the body
a foreign particle which is capable of binding specifically to components of the immune response , such as lymphocytes and antibodies
a foreign substance that triggers a reaction from the immune system
a foreign substance, usually a protein, that, when absorbed by the body, triggers an immune response
a foreign substance, usually a protein, which can harm your body and cause your immune system to respond
a macromolecule that is recognized by antibodies or immune cells and can trigger an immune response
a molecule or compound that signals the presence of an invader in the body
a molecule, or part of a molecule, which has the ability to interact specifically with antibody or cell surface receptors on B and T lymphocytes
a molecule that reacts with an antibody
a molecule that stimulates the production of antibodies
a molecule that triggers an immune system attack
an agent or substance which can be recognised by the body as 'foreign'
a particular physical feature of a disease-causing organism that can be recognized and attacked by the immune system
a piece of a foreign invader that starts an immune response
a protein found in a substance in the body, such as a bacteria or piece of a protein
a protein, in this case produced by the prostate gland
a protein on the surface of a cell that makes antibodies react when an immune system response is required
a protein or carbohydrate that acts as a signal, enabling the body to recognize foreign substances in the body
a protein or other factor associated with invading entity that the immune system specifically recognizes
a protein that causes a response from your immune system (the system that protects you from infection)
a recognizable feature on a foreign body that the immune system uses as a point of recognition
a substance capable of eliciting an immune response in the host
a substance or organism that, when entering the body, causes the production of an antibody to neutralize, destroy, or weaken it
a substance that can act on the immune system and cause the system to create antibodies against it
a substance that can, in certain circumstances, excite the production of a corresponding antibody
a substance that can provoke an immune response
a substance that can stimulate an immune response and react with an antibody or a sensitized T cell
a substance that is recognized by the immune system and induces an immune response
a substance that provokes the formation of antibodies by the immune system to repel what is perceived to be a foreign invader, leading to an allergic reaction
a substance that stimulates an immune The immune system is the collection of organs and tissues involved in the adaptive defense of a body against foreign biological material
a substance which the body recognizes as being alien and therefore potentially harmful
substances capable of stimulating an immune response. The response may be to foreign chemical substances or proteins on the surface of infectious agents, tumor cells, or foreign tissue cells.
Any substance or microorganism that initiates an immune response, such as poisons, viruses, foreign tissue, fungi, or bacteria. A detailed explanation of the human immune system can be found at http://gsbs.utmb.edu/microbook/ch001a.htm.
foreign substance which is not usually part of the body's makeup, and that stimulates antibody production; this antibody reacts specifically with a particular antigen to destroy or weaken it.
anything (usually a protein) that elicits an immune response. Bacteria and viruses are two examples of antigens.
A foreign substance which is identified by the body's immune system and is attacked through humoral and cell-mediated immune response.
A molecule, frequently a protein, which stimulates antibody formation by the immune system of the body. Usually, antigens are foreign, or 'non-self', and antibody formation is protective against developing the disease. For example, the flu vaccine generates antibodies that protect against getting influenza. When antibodies develop against host antigens, however, they are referred to as autoantibodies.
The chemical that is introduced into a person that starts and completes an immune response. When you are vaccinated (measles), the measles virus is the antigen that results in the antibody that protects you from developing measles.
markers on each cell in your body that your immune system identifies as yours. Antigens considered in transplant are called HLA antigens.
Any substance that the body percieves as foreign
An invading substance that may be the target of antibodies.
a substance capable of inducing the formation of antibodies
any substance not normally present in the body that stimulates the body to produce antibodies.
an antigen is any molecule or structure that can bind to antibodies.
A macromolecule that elicits an immune response in the body. The most common antigens are proteins (e.g., natural rubber latex) and polysaccharides (e.g., starch). Antigens may be either exogenous or endogenous to the body.
Amend definition: A microorganism or other foreign substance or protein, such as bee venom or dander.
Any foreign substance which, if present in the body, stimulates the immune system to produce antibodies. Each antigen stimulates specific antibodies.
A molecular protein substance such as a virus, antigens stimulate an "immune response". - Any substance that triggers the immune system to produce an antibody; generally refers to infectious or toxic substances.
is a substance which elicits a specific immune response.
A molecule that is specifically bound by a given antibody.
A substance that, when introduced into the body, signals the immune system to produce antibodies. Bacteria, viruses, and toxins may all act as antigens.
An agent, often a large molecule, that stimulates production of an antibody that will react specifically with it.
Any substance that stimulates the production of antibodies in the body. For example, pollen grains, dust, bacteria and viruses are recognised by the body as being foreign and it responds by producing specific antibodies to the antigen.
any substance which is capable, under appropriate conditions, of inducing a specific immune response and of reacting with the products of that response; that is, with specific antibody e.g. toxins, foreign proteins, bacteria, viruses.
Any substance that the body regards as foreign or potentially dangerous.
A foreign substance that causes the body to produce antibodies as a defense.
A molecule found either inside or on the surface of a cell that can induce an immune response by stimulating the production of antibodies. Antigens are used by the body's immune system to recognise whether the cell is a dangerous foreign intruder or a harmless part of the body. They are like molecular labels.
A protein foreign to the body whose presence triggers an immune response. Some examples of antigens are: microorganisms, toxins, and tissues from another person used in organ transplantation.
Any substance, usually a protein, that causes an antibody response when introduced into the body. Antigens also react with antibodies in serological tests.
A foreign substance that binds to an antibody and starts an immune response in the body.
Substances recognized by the immune system as infectious or foreign. The immune system produces antibodies to fight antigens.
Anything introduced into the body that is seen as foreign. An antigen stimulates the immune system into producing cells that attack it.
Allergy-causing substance
a substance that elicits a specific immunological response, or reacts with antibody in vitro
Any foreign substance that activates the immune system.
Any substance capable of eliciting an immune response.
a substance that causes formation of antibodies.
A protein that is recognised by the body as foreign. An allergen is a specific antigen to which a person is allergic
AN-tee-gen The specific parts of molecules that elicit an immune response. 85
A substance that is bound by antibodies. The name 'antigen' arises from the ability to generate antibodies. Viral and bacterial molecules and even the body's own molecules can be antigens.
A molecule that binds to an antibody or a T cell receptor (TCR). Antigens that bind to antibodies include all class of molecules. TCRs bind only peptide fragments of proteins complexed with MHC molecules; both the peptide ligand and the native protein from which it is derived ate called T cell antigens (1).
Foreign substances that stimulate the body to produce antibodies. Such substances may be used to detect antibodies in the blood serum.
a molecule that is capable of sparking an immune response - usually a foreign or potentially toxic material.
Foreign material, including an organism or its extract, which will produce an immunologic response when inoculated (or inhaled) into a suitable host.
Any substance or agent capable of stimulating an immune (antibody) response.
a substance which provokes antibody formation by the body.
Anything that is capable of triggering an immune response. Antigens are also called immunogens.
A substance capable of provoking an immune response when introduced into the body.
A protein, carbohydrate, or toxin that stimulates an immune response (the production of antibodies) when introduced to the body.
A substance that interacts with an antibody.
A portion of a protein peptide that can be recognised by different members of the immune system.
Any foreign substance, usually a protein, that stimulates a specific immune response.
A compound which combines with the product of a specific immune response.
a substance which is foreign to the organism and can trigger an immune reaction by inducing the formation of antibodies. The antigen can be a virus, a bacteria, a parasite, venom, a vaccine or a cancerous cell.
A substance, such as an organism causing infection or a protein found on the surface of blood cells, that can induce an immune response and cause the production of an antibody.
A chemical substance with the ability to stimulate the body to produce an antibody which will react specifically with that antigen.
A molecular structure on surfaces of such particles as bacteria and viruses. This structure is recognized by the body as 'foreign' and stimulates the body to produce special proteins called antibodies to inactivate this foreign invader. It also stimulates special lymphocytes which directly kill the foreign invader, or release special chemicals which activate macrophages to kill the invader. See also antibody.
any substance capable of inducing antibody formation and of reacting specifically with the antibodies produced.
specific molecule that stimulates antibody response
Any substance capable of stimulating a specific immune response (i.e., a specific antibody) in the body. Antigens are proteins that are present on the surface of all cells and bacteria and viruses. If foreign antigens (such as bacteria, viruses, or grains of pollen) are detected then the body's immune system will attack them. See also: Antibody See also: Monoclonal-Antibody
Any material (usually foreign) that elicits production of and is specifically bound by an antibody.
Antigens are substances not normally found in the human body, that are capable of inducing a response from the immune system. Most of the naturally occurring antigens are large molecules and most are proteins, although high-molecular-weight polysaccharides (sugar) are also potent antigens. Asthma: In simple terms Asthma is a condition in which the airways in the lungs become temporarily narrower; making it difficult to breathe ( an asthma attack). There are many potential causes of asthma, but the attacks are often triggered by pollen or other allergens. Asthma can be defined clinically as a condition of intermittent, reversible airway constriction, due to a hyperreactivity to certain substances producing inflammation. In an asthma attack the smooth muscles of the lungs go into spasm with the surrounding tissue inflammed and secreting mucus into the airways. The diameter of the airways is reduced causing the characteristic wheezing as the person affected breathes harder to get air into the lungs. Attacks can vary in intensity and frequency. Severe asthma attacks may be lethal.
A part of a microorganism (such as bacteria, virus, fungus) or toxin that the immune system recognizes as foreign, and reacts against. Antigens trigger the production of an antibody. Some antigens, called allergens, cause an allergic reaction.
Any substance that causes the body to produce natural antibodies.
A substance foreign to the host animal, commonly a disease agent or vaccine.
A foreign substance, usually a protein, that stimulates an immune response. An antigen contains several sub-units called epitopes (see entry) that are targets of specific antibodies and cytotoxic T-lymphocytes.
A substance that causes the body's immune system to produce antibodies that try to eliminate it because the body sees the antigen as foreign or harmful substance (e.g. from invading viruses or bacteria).
a substance that can trigger an immune response causing the production of antibodies as part of the body's defense against infection and disease.
A substance molecule recognized as foreign by the immune system and which may stimulate the production of a specific antibody and/or stimulate T-cells.
A substance that the body recognizes as foreign causing the immune system to make a specific immune response.
Any substance which stimulates the production of an antibody. Microbial germs and any foreign elements in a normal serum may be antigens.
a foreign substance (such as a virus) that enters the body causes the body's immune system to respond.
A foreign substance (like a bacterium or virus, or parts of them) which triggers an immune response. Vaccines also contain antigens in order to trigger an immune response that is protective against subsequent disease.
Any foreign substance that causes the body's natural antibodies to form
a foreign substance in your body, which causes the immune system to create an antibody to fight it.
A foreign protein, e.g. a bacterium or virus, which stimulates the production of antibodies
Any substance not normally present in the body which causes production of an antibody.
A substance, such as a bacteria, virus or toxin, that triggers a response by the immune system, the human body’s defense mechanism. Cancer may have antigens the immune system may attack.
A foreign substance that stimulates the body to defend itself with an immune response.
a substance, often a protein, which induces an immune response.
a substance produced by a disease-causing organism and that triggers immune response
A foreign agent that stimulates the formation of antibodies in the body
A substance that is a foreign to the body which stimulates the immune system to produce antibodies.
A substance that triggers an immune response because the body recognizes it as foreign (different from normal body components).
Antigens are generally foreign substances such as toxins or bacteria that cause the body to react with an immune system response
A protein "recognized" by the body as being foreign; it results in the production of specific antibodies directed against it.
A general term for a foreign substance introduced into the body that stimulates an immune response, such as a bacterium, virus, or an allergen that is ingested, inhaled or contacted. Antigens are usually proteins. Antigens stimulate plasma cells, which are derived from B lymphocytes, to produce antibodies. Immunizations are the injection of a microbial antigen that are used to provoke plasma cells to make protective antibodies against a specific infectious agent. Immune identity is under genetic control. Thus, the cells of an identical twin do not behave as antigens when injected into the other twin. They could induce an immune reaction if injected into a non-identical sibling or unrelated individual. Thus, bacterial or viral antigens can produce potent and sometimes life-long antibody responses in humans, forming the basis for immunization therapy.
A substance found on the surface of some cells than can trigger an immune response.
A foreign substance that the body recognizes and reacts against through its immune system.
A substance that is recognized by the body as being foreign, and as such, can trigger an immune response. In blood, antigens are usually, but not exclusively, found on the blood cell surface.
anything e.g. bacterium, virus, vaccine that produces a response by the immune system and leads to the production of antibodies.
Any foreign body that causes an immune (protective) response in the body.
An antigen is a foreign substance or protein in the body that can trigger an immune response. This response results in the production of an antibody (a protein that is made by white blood cells) that tries to combat the antigen.
A substance that causes the body to produce natural antibodies.
Any foreign chemical (normally a protein) that induces antibody formation in animals.
a structure foreign to the body, such as a virus. The body usually responds to antigens by producing antibodies.
A protein that prompts the body to produce antibodies.
Any substance that stimulates the production of antibody or reacts with antibody.
molecule inducing production of antibodies specifically targeted against it.
A substance that causes antibodies to form.
Related Topic"A substance, usually protein or protein-sugar complex in nature, which, being foreign to the bloodstream or tissues of an animal, stimulates the formation of specific blood serum antibodies and white blood cell activity..."
A substance that, when introduced into the body, induces an immune response by a specific antibody.
Any substance that can trigger an immune response.
A compound, usually a protein or peptide, that can be recognised by the immune system thereby triggering an immune response.
a substance that induces the formation of antibodies.
any agent or substance that stimulates an immune response. Antigens are often foreign microorganisms such as bacteria or viruses, or the substances they produce.
Any foreign or "non-self" substance that, when introduced into the body, causes the immune system to create an antibody.
Protein present on the surface of cells that can stimulate an immune reaction.
A foreign substance that stimulates the lymphocytes to produce antibodies.
A substance that is recognized by the body as being foreign, thus it can elicit an immune response. In blood banking, antigens are usually, but not exclusively, found on the blood cell membrane.
a substance (usually a protein or carbohydrate, such as from an invading bacterium or virus) that stimulates an immune response.
Substances that are recognized by the immune system and induce an immune reaction.. An antigen can be a foreign protein, toxin, bacteria, or other substance.
a substance, usually a protein, which is recognised as 'foreign' by a patient's body, so that antibodies are produced against it. Reaction between antigen and antibody may cause inflammation.
A germ (like a virus or bacteria) that gets inside the body. It doesn't belong inside the body and can make someone sick if it is not killed. To the body it is an enemy or invader. The germs that cause STDs, including HIV, are ANTIGENS.
Any foreign substance, such as virus, bacterium, or protein, which after introduction into an organism (humans and higher animals), elicits an immune response by stimulating the production of specific antibodies; or any large molecule which binds specifically to an antibody.
A substance that when introduced into the body stimulates the production of an antibody. Antigens include toxins, bacteria, foreign blood cells, and the cells of transplanted organs.
a molecule (typically found in the surface of a cell) whose shape triggers the production of antibodies that will bind to it.
a molecule capable of eliciting a specific antibody or T-cell response; a molecule specifically reacting with an antibody.
a type of protein that is found on the outer surface of the body’s cells.
a protein marker on the surface of cells that identifies the cell.
protein or other substance capable of triggering an immune response.
Antigens are foreign agents like bacteria, viruses and toxic material. When they enter into the body, an immune response is produced by the host to eliminate antigens.
a substance that reacts with antibodies or memory T cells to give rise to an immune reaction. An antigen that binds with a specific antibody or T cell can give rise to allergy.
A substance foreign to the body (usually a protein) which causes the immune system to produce antibodies.
Any substance that stimulates the body to produce antibody.
A substance recognized by the immune system as foreign or toxic which elicits an immune response. Antigens include bacteria, viruses, and chemicals. If the antigen is part of the body, it is called a self antigen. An antigen is any protein that can be recognized as foreign and that will generate an immune response.
Antigens stimulate the production of antibodies which can neutralize or destroy invading organisms. Antigens on the body's own cells are called autoantigens.
A foreign substance, usually protein, such as a fragment of a virus or bacteria, that stimulates an immune response with antibodies or other defenses. An antigen contains several subunits called epitopes (see) that are targets of specific antibodies and cytotoxic T-lymphocytes.
A substance recognized by antibody or a T cell receptor.
any foreign substance which causes the formation of antibodies as protective substances in the body.
A foreign substance (almost always a protein) that, when introduced into the body, stimulates an immune response.
Any foreign agent that can elicit immune response, i.e., stimulates the production of specific proteins by specific cells of immune system. These proteins in turn destroy the foreign agent.
A substance on the surface of red blood cells that elicits an immune response when transfused into a patient who lacks that antigen.
Any substance capable of stimulating the production of antibodies.
Toxins, bacteria, etc. that trigger an immune system response and the production of antibodies.
any exogenous substance capable of provoking a specific immune response.
a substance that stimulates the formation of an antibody
a substance or molecule against which the immune system acts. The antigen can be from foreign material such as bacteria or viruses or from self material.
Any substance that causes antibody formation.
The name given to any substance that is recognised as being ‘hostile’ to the body and causes the production of antibodies.
The name given to any substance that is seen as being ‘an enemy’ to the body and causes antibodies to be made.
(ANN-teh-jin) ( listen) Any substance capable of triggering a response from the immune system
any foreign substance that provokes an immune response when introduced into the body; the immune response usually involves both T-lymphocytes and B-lymphocytes.
An antigen is a substance that, when introduced into the body, stimulates the production of an antibody.
A substance capable of stimulating an immune response by triggering the production of antibodies.
A peptide derived from viral, tumor and in some cases, self products, capable under appropriate conditions of inducing a specific immune response.
The protein part of an organism or cell that the body recognises, rightly or wrongly, as foreign, and which therefore stimulates the production of antibodies to mount a defence immune action. Viruses and bacteria are examples of external antigens. When an antigen comes from part of the body, the reaction is known as auto-immunity. MS may be the result of either an external antigen or an autoimmune response.
a substance or molecule that is recognized by the immune system. The molecule can be from a foreign material such as a bacterium or virus, or the molecule can be from the same organism (one's own body) and called a self-antigen.
a protein or carbohydrate substance (as a toxin or enzyme) capable of stimulating an immune response
a foreign substance recognized by the immune system
A substance, usually a protein, that stimulates the body to produce antibodies against it.
Molecule of carbohydrate or protein which stimulates the production of an antibody, with which it reacts specifically. ( 10)
A foreign substance, such as a virus, bacteria or protein, that triggers an immune response.
An antigen is a substance that can trigger an immune response, resulting in production of an antibody as part of the body's defense against infection and disease. Many antigens are foreign proteins (those not found naturally in the body). An allergen is a special type of antigen which causes an IgE antibody response.
A substance or organism recognised by the body as being foreign, and which stimulates an immune response.
any substance that causes your immune system to produce antibodies against it. An antigen may be a foreign substance from the environment such as chemicals, bacteria, viruses, or pollen. An antigen may also be formed within the body, as with bacterial toxins or tissue cells. barium enema - given in order to perform an x-ray examination of the large intestines. Pictures are taken after rectal instillation of barium sulfate (a radiopaque contrast medium).
Any of various substances capable of stimulating a specific immune response (i.e., production of a specific antibody). Antigens include foreign substances, toxins, bacteria, etc.
A substance, usually a protein, that reacts with a specific antibody and stimulates an immune response.
A substance, usually a protein, that is recognized as foreign by the body's immune system and stimulates formation of a specific antibody to the antigen.
A foreign substance in the body, such as protein, bacteria, viruses, or other materials, that stimulate the body to produce antibodies against them.
A substance which will stimulate the production of antibodies when introduced into the body. Vaccines contain antigens which stimulate the animal to build antibodies against the disease.
Substance which induces the primary or recognition stage of antibody production. A second injection is necessary several days or more after the first to induce the antibody production stage.
Substance which stimulates both stages of antibody production.
A protein on the surface of a virus, bacteria or cell that can stimulate the immune system to produce antibodies as a defense mechanism.
Foreign substance stimulating antibody production; binding partner of antibody
A foreign substance such as a virus or bacterium that causes an immune response or the formation of an antibody.
(adjective ANTIGENIC): any agent or substance that stimulates an immune response.
A foreign substance that, when introduced into the body, stimulates the immune system to produce antibodies as part of the body's defense against infection and disease.
Any substance that, when introduced into the body, is recognized by the immune system.
a foreign substance in the body such as protein, bacteria, virus, pollen and other materials, Antigens stimulate the body to produce antibodies, which them fight them.
a foreign substance that, when introduced into the body, can stimulate an immune response.
Any substance that is recognized by a component of the immune system (i.e. antibodies, cells). Antigens are often agents such as invading bacteria or viruses. (See immunogen.)
A molecule with a configuration that is recognized by the immune system and is usually a part of a protein or sugar. They stimulate the formation of a specific antibody and trigger an immune response. Antigens can include toxins, bacteria, foreign blood cells, and the cells of transplanted organs.
Any substance that is recognized by a component of the immune system as foreign. Infectious disease antigens consist of parts of pathogens such as bacteria or viruses.
A substance that can trigger an immune response, resulting in antibody production. All allergens are antigens, but all antigens are not allergens.
Antibody generator. An antigen is anything that can be detected by an antibody and induce an immune response. They are usually small proteins on the surface of pathogenic cells, but can also be bits of DNA, phospholipids or sugar and may be found on our own cells.
Foreign substances (e.g. bacteria or viruses) in the body that are capable of causing disease. The presence of antigens in the body triggers an immune response, usually the production of antibodies.
something recognised by the immune system (usually foreign proteins)
A substance that induces the production of antibodies.
A foreign substance which causes the body to produce antibodies.
foreign, non-self immunogenic material that elicits an immune response
Gastrointestinal Proteins
A foreign protein that causes an immune response (the production of antibodies to fight antigens). Common examples of antigens are the bacteria and viruses that cause human disease. The antibody is formed in response to a particular antigen unique to that antigen, reacting with no other.
A substance which, when introduced into the body, stimulates the production of antibodies. Bacteria, their toxins, red blood corpuscles, tissue extracts, pollens, dust, and many other substances may act as antigens.
A foreign substance that stimulates an immune response. Many antigens are things that are not found in your body naturally, such as bee venom or tree pollen. When you are exposed to an antigen, the white blood cells called lymphocytes will make antibodies. (See definition for antibody.)
A substance that causes a reaction from the body's immune system.
any substance that stimulates the immune system to produce antibodies.
A foreign (nonself) protein or carbohydrate complex that causes an immune response (see Allergies, Arthritis).
Proteins located on the surface of all cells. The immune System uses antigens to determine whether cells are a necessary part of the body or need to be destroyed.
A substance which, under appropriate conditions, triggers an immune response. Vaccines are specially prepared antigens.
A protein, toxin, or other substance that makes the body react by producing antibodies.
A molecule that is recognized by antibody (immunoglobulin) molecules. Generally, multiple antibody molecules can recognize a given antigen.
Substance that reacts with an antibody. It contains an area on its surface to which antibody binds.
A foreign substance that can induce the body to produce antibodies.
A foreign material or substance that stimulates the formation of antibodies when introduced into the tissues and blood stream.
A chemical substance that stimulates an immune system response. This reaction often involves production of antibodies. For example, the immune system’s response to antigens that are part of bacteria and viruses helps people resist infections. Cancer cells have certain antigens that can be detected by laboratory tests, and are important in cancer diagnosis and in monitoring response to treatment. Other cancer cell antigens play a role in immune reactions that may help the body’s resistance against cancer.
a foreign substance, usually a protein, that produces an immune response in animal tissues.
A toxic substance in the blood which the body reacts to by forming antibodies.
A substance that can elicit the formation of an antibody when introduced into the body.
Foreign macromolecule which does not belong in the host body and which can be bound by antibody or by T-cell receptor.
A protein in a cell that has the capability of inducing a specific immune response from the body.
a substance which when introduced into the body is capable of inducing specific immune responses, including antibody formation, or immunity against disease.
Any foreign material that is specifically bound by specific antibody or specific lymphocytes; also used loosely to describe materials used for immunization. Antigens may also be immunogens if they are able to trigger an immune response, or haptens if not.
A substance (usually a protein) identified as foreign by the body's immune system, triggering the release of antibodies as part of the body's immune response.
A substance foreign to the body, often a protein; it causes the body to form an antibody that reacts only to that antigen.
A substance that is recognized by the immune system and triggers an immune reaction
The term for a substance or molecule recognized by the immune system—either from a pathogen such as a virus or, in error, from the body's own cells (“self”). In MS, the myelin that surrounds nerves is mistaken as an antigen.
A foreign molecule or substance, such as a transplant, that triggers an immune response. This response leads to the production of antibodies, which, in turn, try to inactivate or destroy the antigen (transplanted organ).
The active component of a vaccine which is recognized as foreign by the animal and induces an acquired immune response. Antigens may include substances such as bacteria, viruses, toxins or foreign proteins.
Any substance that is detected by the body's immune system. Discovery of an antigen usually stimulates formation of antibodies to combat it. (see antibodies, above)
any substance that triggers an immune response.
A substance recognized as foreign by the immune system and that may trigger an immune response.
A substance capable of stimulating the production of antibodies in living organisms and reacting specifically with them.
A macromolecule (usually a protein foreign to the organism), which elicits an immune response on first exposure to the immune system by stimulating the production of antibodies specific to its various antigenic determinants. During subsequent exposures, the antigen is bound and inactivated by these antibodies. Source: http://www.biobasics.gc.ca/english/View.asp?x=696&mid=410
A foreign substance (usually proteinaceous or high molecular weight polysaccharide) which induces the formation of antibodies. Examples are bacteria, viruses, endo/exotoxins, pollen and vaccines.
A substance that the body recognizes as foreign- or something it should destroy. The body makes antibodies that recognize these antigens.
Any substance (usually foreign) that, when introduced into the body of an animal, will stimulate the formation of specific antibodies.
A substance that stimulates the production of antibodies.
A substance capable of inducing the production of antibodies.
Genetic product (protein) that is detected by immunological techniques (using antibodies).
A foreign substance in the body, such as the hepatitis B virus.
An antigen is any substance which stimulates cells to produce antibodies.
Substance creating reaction by immune system.
A substance creating an immune response within the body.
A substance that is capable of causing the production of an antibody . See the entire definition of Antigen
a foreign substance, usually a bacteria or virus, that stimulates the immune system.
refers to a substance that is capable of stimulating an immune response.
Substance capable of binding with an antibody produced by the immune system.
Foreign substance that when introduced into body tissues, induces an immune response by a specific antibody. See antibody.
Any substance that when introduced into the body (such as the protein coat of an invading pathogen) causes the formation of antibodies. Ag is also found on tissue and blood cells, and in body fluids. Measurement of antigen can help determine whether a particular disease will become active.
A foreign substance that activates the immune system by causing the body to form antibodies.
A marker on the surface of a cell that can stimulate production of an antibody. With immunotherapies for cancer, the antibody targets the antigen on the cancer cell to kill that cell.
Any foreign molecule that reacts with specific receptors on T and T cells so that stimulates a specific immune response.
A foreign agent capable of starting an immune response or causing the body to produce antibodies.
A substance (usually foreign) that stimulates the immune response. In people with autoimmune disease, the body's own cells may be seen as antigens.
A substance which, after take-up by an organism, elicits an immune response.
A molecule which reacts with preformed antibody and the specific receptors on T and B cells.
Any substance that induces the formation of an antibody.
A substance which elicits the synthesis of antibody with which it specifically reacts.
An antigen is a molecule that stimulates an immune response. The word originated from the notion that they can stimulate antibody generation. We now know that the immune system does not only consist of antibodies.
