ENU-induced G to T transversion at base pair 36,550,311 (v38) on chromosome 1, or base pair 8,071 in the GenBank genomic region NC_000067 encoding Sema4c. The mutation corresponds to residue 2,251 in the NM_001304330 mRNA sequence in exon 16 of 16 total exons, to residue 2,136 in the NM_001126047 mRNA sequence in exon 15 of 15 total exons, and to residue 1,971 in the NM_001304329 mRNA sequence in exon 15 of 15 total exons. The mutation results in a cysteine (C) to phenylalanine (F) substitution at position 578 (C578F) in all isoforms of the SEMA4C protein.