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cytokine

A Dictionary of Biology | 2004 | © A Dictionary of Biology 2004, originally published by Oxford University Press 2004. (Hide copyright information) Copyright

cytokine Any soluble factor secreted by cells of the lymphoid system that acts as a signal to other lymphoid cells. There are two categories: lymphokines, secreted by lymphocytes; and monokines, secreted by macrophages. However, certain cytokines, notably interferons and interleukins, are secreted by both lymphocytes and macrophages.

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