PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 9852097-5 1998 Unlike most other sterol hydroxylases, cholesterol 25-hydroxylase is not a cytochrome P450, but rather it is a member of a small family of enzymes that utilize diiron cofactors to catalyze the hydroxylation of hydrophobic substrates. diiron 160-166 cholesterol 25-hydroxylase Homo sapiens 39-65