IGEM:MIT/2005/Definitions
From OpenWetWare
cytokine an intercellular chemical messenger protein (eg, tumor necrosis factor, interleukin) released by white blood cells. Cytokines facilitate communication among immune system cells and between immune system cells and the rest of the body.
hapten a part of an antigene
hematopoietic an agent or process that affects or promotes the formation of blood cells.