title: Serum progesterone during pregnancy and pseudopregnancy and gestation length in the aging rat.
mesh_terms: D000375:Aging; D000818:Animals; D004971:Estrus; D005260:Female; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone / Q000097:blood*; D011555:Pseudopregnancy / Q000097:blood*; D051381:Rats / Q000097:blood* / Q000502:physiology
chemical_list: D011374:Progesterone