NCIt definition : Peptides with direct synaptic effects or indirect modulatory effects on the nervous
system. A neuropeptide is a molecule released by neurons as an intercellular neurotransmitter.
Alternatively, neuropeptides can be released by non-neuronal cells as hormones. They
are endogenous peptides such as endorphins that influence neural activity or functioning.;
Alternative definition : NCI-GLOSS: A member of a class of protein-like molecules made in the brain. Neuropeptides
consist of short chains of amino acids, with some functioning as neurotransmitters
and some functioning as hormones.;