catalytic activity:(24R)-cholest-5-ene-3-beta,24-diol + NADPH + O(2) = (24R)-cholest-5-ene-3-beta,7-alpha,24-triol + NADP(+) + H(2)O.,cofactor:Heme group.,function:Involved in the bile acid metabolism. Has a preference for 24-hydroxycholesterol, and converts it into a 7-alpha-hydroxylated product.,similarity:Belongs to the cytochrome P450 family.,tissue specificity:Liver specific.,