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Interleukin-1 (IL-1) is a cytokine in the chemokine family. A total of 38 interleukins have been found, named IL-1---IL38. They have complex functions. Interleukin-1 is also known as lymphocyte stimulating factor. Mainly produced by activated monocyte-macrophages. The main forms are IL-1α and IL-1β, which can synergistically stimulate the activation of APC and T cells, promote the proliferation of B cells and secrete antibodies, induce the synthesis of proteins in the acute phase of the liver, and cause fever and cachexia.