cytochrome-b5 reductase activity, acting on NADPH
cytochrome-b5 reductase activity, acting on nadph
2 Fe(III)-[cytochrome b5] + NADPH = 2 Fe(II)-[cytochrome b5] + NADP(+) + H(+)
2 fe(iii)-[cytochrome b5] + nadph = 2 fe(ii)-[cytochrome b5] + nadp(+) + h(+)