ENU-induced A to G transition at base pair 43,409,422 (v38) on chromosome 7, or base pair 1,230 in the GenBank genomic region NC_000073. The mutation corresponds to residue 743 in the mRNA sequence NM_172900 within exon 4 of 12 total exons. The mutation results in a serine to glycine substitution at position 200 (S200G) in the Siglec-G protein. (J:272022)