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Definition: A polypeptide hormone that mediates communication between cells participating in an immune response and is secreted as a neurotransmitter by the brain. Many different cytokines have been isolated and these can affect cells that secrete them, nearby cells, or cells at distant locations. Includes adipokines.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.