a small protein which binds to specific receptors on the surface of immune system cells, particularly phagocytic cells and lymphocytes. Chemokines play a crucial role in inflammatory responses.
a type of cytokine, a soluble factor secreted by certain immune system cells that stimulates the activity of other cells. Certain chemokine receptors (e.g., CCR5, CXCR4) are necessary for entry by HIV into cells.
A small, soluble protein with a wide range of immunoregulatory functions.