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Cytokine
Cytokines are small proteins that mediate and regulate immune responses, inflammation, and cell signaling
Hormone
Hormones are chemical messengers secreted by endocrine glands into the bloodstream.
Neurotransmitter
Neurotransmitters are chemical signals used by neurons to communicate across synapses, the tiny gaps between nerve cells or between nerve cells and other target cells.
Second Messenger
A second messenger is a molecule that relays signals from the cell surface to the interior and amplifies the signal inside the cell.