Assertion: nervous system's cell | /r/CapableOf | release substance
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text: It is not yet clear whether epithelial cells such as enterochromaffin cells release substances, for instance serotonin, in response to chemical or mechanical stimuli, to activate the endings of the primary afferent neurones.7They represent about 30% of myenteric neurones and 14% of submucosal neurones, have a distinct Dogiel type II shape and have a long after hyperpolarisation following action potentials.