Effects of sex steroids on brain beta-endorphin.
D000818:Animals; D002369:Castration; D004305:Dose-Response Relationship, Drug; D004723:Endorphins / Q000378:metabolism*; D004958:Estradiol / Q000494:pharmacology*; D004971:Estrus; D005260:Female; D007031:Hypothalamus / Q000187:drug effects* / Q000378:metabolism; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D001615:beta-Endorphin
D004723:Endorphins; D011374:Progesterone; D004958:Estradiol; D001615:beta-Endorphin