Apr 6, 2014
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A family of PROTEIN molecules that carry signals locally between cells. Cytokines are released by cells when activated by antigens (see ANTIGEN), behaving as enhancing mediators for immune response. These proteins include INTERLEUKINS (produced by LEUCOCYTES), lymphokines (produced by lymphocytes – see LYMPHOCYTE), INTERFERON, and tumour necrosis factor, one of whose many functions is killing tumour cells.

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