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  • Neurotransmitters are endogenous chemicals that transmit signals across a synapse from one neuron to another 'target' neuron. Neurotransmitters are released from synaptic vesicles in synapses into the synaptic cleft, where they are received receptors on other synapses. Many Neurotransmitters are synthesized from plentiful and simple precursors such as amino acids, which are readily available from the diet and only require a small number of biosynthetic steps to convert them. Neurotransmitters play a major role in shaping everyday life and functions. Scientists do not yet know exactly how many neurotransmitters exist, but more than 100 chemical messengers have been identified.

Freebase Commons Chemistry /chemistry

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