Albrecht, E D Pregnancy in young and aged rats. I. Ovarian progesterone and 20 alpha-hydroxypregn-4-en-3-one formation. [electronic resource] - Endocrinology Oct 1984 - 1418-25 p. digital Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S. ISSN: 0013-7227 Standard No.: 10.1210/endo-115-4-1418 doi Subjects--Topical Terms: 20-alpha-Dihydroprogesterone--biosynthesisAge FactorsAnimalsFemaleHydroxyprogesterones--metabolismLitter SizeMaleOvary--metabolismPregnancyPregnancy, AnimalPregnenolone--metabolismProgesterone--analogs & derivativesProteins--metabolismRatsRats, Inbred Strains