Phytoceramide; Ceramide II; N-Acyl-4-hydroxysphinganine; (4R)-4-Hydroxysphinganine ceramide

(4R)-4-hydroxysphinganine ceramide,ferrocytochrome-b5:oxygen oxidoreductase (fatty acyl 2-hydroxylating); Phytoceramide + 2 Ferrocytochrome b5 + Oxygen + 2 H+ <=> (2'R)-2'-Hydroxyphytoceramide + 2 Ferricytochrome b5 + H2O

(4R)-4-hydroxysphinganine ceramide,ferrocytochrome b5:oxygen oxidoreductase (8,9-trans-dehydrogenating); Phytoceramide + 2 Ferrocytochrome b5 + Oxygen + 2 H+ <=> (4R,8E)-4-Hydroxysphing-8-enine ceramide + 2 Ferricytochrome b5 + 2 H2O

(4R)-4-hydroxysphinganine ceramide,ferrocytochrome b5:oxygen oxidoreductase (8,9-cis-dehydrogenating); Phytoceramide + 2 Ferrocytochrome b5 + Oxygen + 2 H+ <=> (4R,8Z)-4-Hydroxysphing-8-enine ceramide + 2 Ferricytochrome b5 + 2 H2O