A white blood cell; functions to destroy foreign substances.
General term for a molecule recognized by a binding structure such as a receptor.
The tissue fluid which drains into and through the lymphatic system.
A type of non-granular leukocyte(white blood cell) that mainly stays in lymphatic tissue (e.g., the lymph nodes) and is active in immune responses, including the production of antibodies.
A cytokine secreted by helper T cells in response to stimulation by antigens and that play a role in cell-mediated immunity.
Membrane-bound vesicles, found in most cells especially phagocytic cells, usually containing hydrolytic enzymes.
An enzyme found in saliva and sweat and tears that destroys the cell walls of certain bacteria