Evidence for role of endogenous sex steroids in morphine antinociception.
D000315:Adrenalectomy; D000698:Analgesia; D000818:Animals; D002369:Castration; D012739:Gonadal Steroid Hormones / Q000502:physiology*; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D010146:Pain; D051381:Rats; D013256:Steroids
D012739:Gonadal Steroid Hormones; D013256:Steroids; D009020:Morphine