label: sphingolipid C4-monooxygenase activity
label_lc: sphingolipid c4-monooxygenase activity
description: "Catalysis of the reaction: a dihydroceramide + 2 Fe(II)-[cytochrome b5] + 2 H+ + O2 = a phytoceramide + 2 Fe(III)-[cytochrome b5] + H2O."