Isolation and characterization of the mouse heme oxygenase-1 gene. Distal 5' sequences are required for induction by heme or heavy metals. Mouse genomic fragments encoding heme oxygenase-1 (HO-1) were isolated from a recombinant lambda library by in situ plaque hybridization. The mouse HO-1 gene, approximately 7 kilobase pairs (kbp) in length, is organized into 5 exons and 4 i