A type of protein that acts as a signaling molecule between white blood cells (leukocytes) in the immune system. These cytokines coordinate immune responses and inflammation.
Coined in 1979 from Latin 'inter-' (between) + Greek 'leukos' (white) + '-in' (protein suffix). The name literally means 'between white cells', describing their function as communication molecules in the immune system.
Interleukins are like the immune system's text messages - different numbered types (IL-1, IL-2, etc.) carry specific instructions between cells, coordinating everything from inflammation to tissue repair, making them crucial targets for treating autoimmune diseases and cancer.
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