One of the major groups of white blood cells. The three main kinds of lymphocytes are T cells, B cells, and Natural Killer cells. T cells attack and destroy virus-infected cells, foreign tissue and cancer cells. B cells help produce antibodies or proteins that help destroy foreign substances. Natural Killer cells destroy cancer cells and virus-infected cells.
A major category of white blood cell that initiates the immune response. Collections of lymphocytes are organized into lymph nodes. When stimulated by an antigen the lymphocyte produces a variety of chemicals called lymphokines that perform immune response functions.
White blood cell that makes an immune response when activated by a foreign molecule (an antigen). T lymphocytes develop in the thymus and are responsible for cell-mediated immunity. B lymphocytes develop in the bone marrow in mammals and are responsible for the production of circulating antibodies.
cell made by stem cells (cells in the bone marrow which make many other kinds of cells) that goes to the lymphoid tissue in the thymus or bone marrow. They fight infections and make up a large portion of cells in the blood.
a leukocyte of blood, bone marrow and lymphatic tissue. Lymphocytes play a major role in both cellular and humoral immunity, and thus several different functional and morphologic types must be recognized, i.e. the small, large, B-, and T-lymphocytes, with further morphologic distinction being made among the B-lymphocytes.
A white blood cell having a round or oval nucleus and sky blue cytoplasm. The nuclear chromatin is densely clumped but separated by many clear areas giving a "hill and valley" effect. A few red-purple (azurophilic) granules may be present in the cytoplasm.
a type of white cell that fights infection by producing antibodies and other defense substances; occurs in 2 forms: B cells that recognize specific antigens and produce antibodies against them, and T cells that are agents of the immune system.
White blood cell responsible for the orchestration of immunity to infection by micro-organisms. B lymphocytes produce antibody and T lymphocytes have helper (CD4), suppressor (CD8) and cytotoxic (CD8) roles.
Any of the nearly colorless cells found in the blood, lymph, and lymphoid tissues, constituting approximately 25 percent of white blood cells and including B cells, which function in humoral immunity, and T cells, which function in cellular immunity.
Small white blood cells that are uniform in appearance, but very diverse in function. Collectively, they are responsible for antibody production, direct cell-mediated killing of virus-infected cells and tumor cells, and for the regulation of virtually every other component of the mammalian immune system.
A variety of white blood cells (immune cells), that are formed in bone marrow and the thymus. These cells congregate in the lymph nodes and other organs, and travel throughout the body in lymph fluid or the bloodstream.
Type of white blood cell with a number of roles in the immune system, including antibody production, attacking and destroying foreign cells (including some cancer cells), and producing substances that can kill cancer cells.
A type of white blood cell that is important in the formation of antibodies. Doctors can monitor the health of AIDS patients by measuring the number or proportion of certain types of lymphocytes in the patient's blood.
Type of leukocyte (white blood cell) that mainly resides in lymphatic tissue (e.g., the lymph nodes) and is active in immune responses, including the production of antibodies; two types include B cells and T cells
Leukocyte with a large round nucleus and usually a small cytoplasm. Specialized types of lymphocytes have enlarged cytoplasms and produce antibodies. Other specialized lymphocytes are important in cellular immune responses.
A lymphocyte is any of a group of white blood cells of crucial importance to the adaptive part of the body's immune system. The adaptive portion of the immune system mounts a tailor-made defense when dangerous invading organisms penetrate the body's general defenses.
A variety of leukocyte or white blood cell that is important to the immune response and that arises in the lymph nodes. Lymphocytes can be large or small, and are round, nongranular, and classified as either T- or B-lymphocytes.
White blood cells that kill viruses and defend against the invasion of foreign material. These cells mediate the specificity of immune responses. See B cell and T cell. lymphoma: Cancer of lymphocytes or the lymphoid system (e.g., Hodgkin's disease, non-Hodgkin's lymphoma).
White blood cells of the immune system; the two types of lymphocytes are T cell (CD8 and CD4) and B cell; kills and destroys foreign pathogens entering the body (bacteria, viruses, parasites and fungi).
The diverse set of white blood cells (each with different functions) that are responsible for immune responses. There are two main types: B-cells (responsible for producing antibodies) and T-cells (which orchestrate all aspects of the immune response and carry out specialized functions such as destroying cells infected with pathogens). The cells are produced in the bone marrow and thymus, respectively.
A lymphocyte is a type of white blood cell present in the blood. A cell is the smallest, most basic unit of life, that is capable of existing by itself. White blood cells help protect the body against diseases and fight infections.
A small white blood cell that plays a major role in defending the body against disease. There are two main types of lymphocytes: B cells, which make antibodies that attack bacteria and toxins, and T cells, which attack body cells themselves when they have been taken over by viruses or become cancerous.
This is a white blood cell that is in charge of starting antigen specific immunity responses. There are many types of lymphocytes in the immune family. These consist of T cells, B cells, granulocytes, basophils, mast cells, eosiniophils, Natural Killer Cells, etc. Each cell type has a CD designation. (See guide to interpret the results of the reproductive immunophenotype.
Lymphocytes are a variety of white blood cells present in blood, lymph nodes, spleen, thymus gland, gut wall and bone marrow. Important to the immune system, they produce circulating antibodies and T-lymphocytes, which are primarily responsible for cell-mediated immunity and can differentiate into helper, killer or suppressor cells.
Cell present in the blood and lymphatic tissue, the main means of providing the body with immune capability. This is done by means of humoral immunity produced by B cells and cell-mediated immunity produced by T cells.
One of the three types of white blood cells (the others being granulocytes and monocytes), and the primary cell of the immune response, responsible for attacking antigens; divided into two forms, B cells and T cells.
A type of white blood cell found in lymph, blood, and other specialized tissue such as bone marrow and tonsils, constituting between 22 and 28 percent of all white blood cells in the blood of a normal adult human being. B- and T-lymphocytes are crucial components of the immune system. The B-lymphocytes are primarily responsible for antibody production. The T-lymphocytes are involved in the direct attack against living organisms. The helper T-lymphocyte, a subtype, is the main cell infected and destroyed by the AIDS virus.
lymphocyte is a type of white blood cell in the human immune system. All lymphocytes derive from a common progenitor, which itself originates in the stem cells in the bone marrow. There are three types of lymphocytes â€“ T cells, B cells, and NK cells. [ edit
A lymphocyte is a type of white blood cell involved in the vertebrate immune system. There are two broad categories of lymphocytes, namely the large granular lymphocytes and the small lymphocytes. The large granular lymphocytes are more commonly known as the natural killer cells (NK cells).