Enzymatic reactions [BR:br08201]
1. Oxidoreductase reactions
1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
1.14.14 With reduced flavin or flavoprotein as one donor, and incorporation of one atom of oxygen into the other donor
1.14.14.14
R01840 Androstenedione + [Reduced NADPH---hemoprotein reductase] + Oxygen <=> 19-Hydroxyandrost-4-ene-3,17-dione + [Oxidized NADPH---hemoprotein reductase] + H2O