A false neurotransmitter is a chemical compound which closely imitates the action of a neurotransmitter in the nervous system. Examples include 5-MeO-αMT (mimicking serotonin) and α-methyldopa. These chemicals can be accumulated by a neuron or secretory cell, are then packaged in secretory / synaptic vesicles, and then released with other neurotransmitters when an action potential provides the necessary stimulus for release.