Zaslat záznam e-mailem: Identification of the C9-hydrogenase for 9,17-dioxo-1,2,3,4,10,19-hexanorandrostan-5-oic acid (9,17-DOHNA) and the 7α-dehydratase essential for initiating β-oxidation of the B-, C-, and D-rings in steroid degradation by Comamonas testosteroni TA441