Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. This isozyme seems responsible for metabolism of 2,2',4,4',5,5'-hexachlorobiphenyl. an organic molecule + O2 + reduced [NADPH--hemoprotein reductase] = an alcohol + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Preputial gland, but not in liver. Belongs to the cytochrome P450 family.