4alpha-carboxyzymosterol + NADP(+) = zymosterone + CO2 + NADPH
4alpha-carboxyzymosterol + nadp(+) = zymosterone + co2 + nadph
4alpha-carboxyzymosterol + NADP(+) = zymosterone + CO2 + NADPH
4alpha-carboxyzymosterol + nadp(+) = zymosterone + co2 + nadph