neuropeptide

https://doi.org/10.1351/goldbook.16265
One of a group of small proteins (peptides) that serve as neurotransmitters in the brain, autonomic nervous system and neuroendocrine system.
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 889 [Terms] [Paper]