EC=1.14.13.159 Alternative name(s): Cytochrome P450 2R1 Function Has a D-25-hydroxylase activity on both forms of vitamin D, vitamin D2 and D3. Ref.1 Ref.2 Ref.5 Catalytic activity Calciol + O2 + NADPH = calcidiol + NADP+ H2O. Ref.1 Ref.2 …