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neuromodulator

neuromodulator

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A neuromodulator is a chemical messenger released from a neuron in the central nervous system (the brain or spinal cord), or in the periphery, that affects not a single cell but groups of neurons or effector cells that have the appropriate receptors. Unlike a neurotransmitter, it may not be released at synaptic sites, it often acts through second messengers, and it can produce long-lasting effects. The release may be local, so that only nearby neurons or effectors are influenced, or it may be more widespread.

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