Cytochrome P450, family 27, also known as CYP27, is a Deuterostome cytochrome P450 monooxygenase family found in human genome. [1] [2] This family belongs to Mitochondrial clan CYPs, which is located in the inner membrane of mitochondria(IMM). There are three members in the human genome, CYP27A1, CYP27B1 and CYP27C1, [3] and an ortholog CYP27F1 in sea urchins, Strongylocentrotus purpuratus . [4]