ENU-induced C to T transition at base pair 11,768,961(v38) on chromosome 11, or base pair 83,993 in the GenBank genomic region NC_000077 encoding Ikzf1. The mutation corresponds to residue 1,486 in the mRNA sequence NM_001025597 within exon 8 of 8 total exons. The mutation results in substitution of glutamine 310 for a premature stop codon (Q310*) in variant 1 of the IKZF1 protein.