The male frog, Rana pipiens, as a test animal for determining the level of urinary chorionic gonadotrophin during pregnancy.
D000818:Animals; D006063:Chorionic Gonadotropin; D006062:Gonadotropins; D011247:Pregnancy; D011894:Rana pipiens; D014551:Urinary Tract
D006063:Chorionic Gonadotropin; D006062:Gonadotropins
GONADOTROPIN; PREGNANCY