2 Fe(II)-[cytochrome b5] + NADP(+) + H(+) => 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(+) => 2 Fe(III)-[cytochrome b5] + NADPH
2 fe(ii)-[cytochrome b5] + nadp(+) + h(+) => 2 fe(iii)-[cytochrome b5] + nadph