The conversion of pregnenolone to a more active progestational substance by incubation with endocrine tissues in vitro.
D004702:Endocrine Glands; D006801:Humans; D066298:In Vitro Techniques; D011284:Pregnenolone; D011374:Progesterone
D011374:Progesterone; D011284:Pregnenolone
PREGNENOLONE; PROGESTERONE