This mutation, discovered among G3 progeny of an ENU mutagenized male mouse, was mapped to Chr 10. It has been identified as a deletion spanning exons 27 through 29 of the 39 exons of Pcdh15 (based on the longest cDNA sequences), from nucleotide position 685,325 to 779,172 (Genbank accession NC_000076; genomic DNA sequence).