Cyclical changes in the vaginal smears of senils nulliparous and multiparous rats.
D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D004971:Estrus; D005260:Female; D006801:Humans; D010298:Parity; D051381:Rats; D014626:Vaginal Smears
ESTRUS/in old age; VAGINAL SMEARS/in old age