Polypeptides as central transmitters.
D000818:Animals; D002490:Central Nervous System / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D004347:Drug Interactions; D004745:Enkephalins / Q000494:pharmacology; D009496:Neurotensin / Q000502:physiology; D018377:Neurotransmitter Agents / Q000032:analysis; D009842:Oligopeptides / Q000502:physiology; D010455:Peptides / Q000378:metabolism / Q000502:physiology*; D013373:Substance P / Q000494:pharmacology
D004745:Enkephalins; D018377:Neurotransmitter Agents; D009842:Oligopeptides; D010455:Peptides; D013373:Substance P; D009496:Neurotensin