The various chemical signals of the immune response, which include small proteins like histamine, are collectively called cytokines.
Histamine is a nitrogenous compound that serves multiple purposes inside the human body. It acts as a neurotransmitter, it also takes part in immune responses, and it also regulates some functions inside the gut. The inflammatory response of histamines produces itching.
Cytokines are a class of proteins involved in the cell signaling processes. They regulate the growth of various immune cells in the body. The examples of cytokines are: interferon, interleukins, growth factors, etc. The cytokines are synthesized by the T cells and macrophages.
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