[Endogenous morphine-like substances (author's transl)].
D000818:Animals; D004723:Endorphins / Q000096:biosynthesis / Q000302:isolation & purification / Q000378:metabolism*; D006168:Guinea Pigs; D011957:Receptors, Opioid / Q000378:metabolism
D004723:Endorphins; D011957:Receptors, Opioid