Although most neurotransmitters perform the same basic role, they are not fungible. Each takes the baton from an incoming action potential and passes the neural message across the synaptic divide, yet each flavor of transmitter adds its own unique twist. Simply put, they have completely different metabolic actions. Properly functioning brains require the eclectic services of all of them, everywhere, all the time. In nearly every remote outpocket of the brain, whether retina, olfactory bulb, or even transmitter-specific projection nuclei of the brainstem, all of the major transmitter systems can be found within each.
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