Endogenous opioid peptides.
D000818:Animals; D001923:Brain Chemistry; D055598:Chemical Phenomena; D002621:Chemistry; D004723:Endorphins / Q000032:analysis / Q000502:physiology* / Q000627:therapeutic use; D004745:Enkephalins / Q000032:analysis; D006801:Humans; D051381:Rats; D012559:Schizophrenia / Q000188:drug therapy
D004723:Endorphins; D004745:Enkephalins