There is a set of criteria that identifies a substance as a neurochemical. When many of the neurotransmitters are amino acids that would be present in a neuron anyway, why are criteria needed: Do these criteria provide some advantage?

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The Answer of  There is a set of criteria that identifies a substance as a neurochemical. When many of the neurotransmitters are amino acids that would be present in a neuron anyway, why are criteria needed: Do these criteria provide some advantage?

There Is a Set of Criteria That Identifies a Substance