| def | "Any intracellular signal transduction in which the signal is passed on within the cell via a second messenger; a small molecule or ion that can be quickly generated or released from intracellular stores, and can diffuse within the cell. Second-messenger signaling includes production or release of the second messenger, and effectors downstream of the second messenger that further transmit the signal within the cell." [GOC:signaling, ISBN:0815316194, PMID:15221855, Wikipedia:Second_messenger_system]
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