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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
False neurotransmitter (FN). This ectopic compound, considered “unwanted,” enters a neuron or is directly formed in the neuron. The FN will replace the endogenous neurotransmitter (EN) in synaptic storage vesicles and can be released in response to a depolarizing stimulus.