3beta-hydroxypregn-5-en-20-one ( pregnenolone ) and nad+ were incubated with a solubilized preparation of the coupled enzyme 3beta-hydroxysteroid : nad ( p ) oxidoreductase-3-ketosteroid delta4 , delta5-isomerase ( 3beta-hydroxysteroid dehydrogenase : delta5-isomerase ) from the mitochondrial fraction of human placenta .
C2983553
delta4
C0086418
human