ENU-induced C to A transversion at base pair 29,069,090 (v38) on chromosome 6, or base pair 10,628 in the GenBank genomic region NC_000072 encoding Lep. The mutation corresponds to residue 198 in the mRNA sequence NM_008493 in exon 2 of 3 total exons. The mutation results in a histidine (H) to asparagine (N) substitution at position 47 (H47N) in the leptin protein.