Interleukins are a large and varied category of cytokines produced by leukocytes, especially T-cells. Their function depends on the type of white blood cell with which they interact. Lymphokines coordinate the immune response through communication with other cells. Monokines come from monocytes or macrophages and fulfill many of the same functions as lymphokines. Cytokines secreted by T-cells and macrophages coordinate the entire network of interacting cells during an immune response.

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