the conversion of radiolabelled progesterone to its identified c21 catabolites ( 20 alpha-hydroxy-4-pregnen-3-one and 3 alpha-hydroxy-5 alpha-pregnan-20-one ) was significantly lower in fw than in g+t incubations .
C0033308
progesterone
C0012311
20 alpha-hydroxy-4-pregnen-3-one