Cytochrome P450 26B1 (CYP26B1)

Involved in the metabolism of retinoic acid (RA), rendering this classical morphogen inactive through oxidation. Involved in the specific inactivation of all-trans-retinoic acid (all-trans-RA), with a taste for the following substrates: all-trans-RA > 9-cis-RA > 13-cis-RA.

Generates several hydroxylated forms of RA, including 4-OH-RA, 4-oxo-RA, and 18-OH- RA. Essential for postnatal survival.