title: Putative peptide neurotransmitters: the opioid peptides.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism; D004399:Dynorphins; D004723:Endorphins / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000494:pharmacology; D004745:Enkephalins / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000494:pharmacology; D009474:Neurons / Q000378:metabolism; D010446:Peptide Fragments / Q000096:biosynthesis / Q000494:pharmacology; D011957:Receptors, Opioid / Q000378:metabolism; D009435:Synaptic Transmission
chemical_list: D004723:Endorphins; D004745:Enkephalins; D010446:Peptide Fragments; D011957:Receptors, Opioid; D004399:Dynorphins