ENU treatment induced an A-to-T transversion at base pair 121,228,606 (GRCm38) on chromosome 2, or base pair 61,720 in the GenBank genomic region NC_000068 encoding Trp53bp1. The mutation corresponds to residue 2,902 in the mRNA sequence NM_013735 within exon 13 of 28 total exons. The mutation results in substitution of arginine 925 with a stop codon (p.R925*) in the protein. (J:272848)