Schematic presentation of the cd locus and the CNGB3 deletion. The initial screening confirmed the presence of four genes within the disease locus: SLC7A13, WWP1, CNBD1, and MMP16. Fine mapping identified a 404,820 bp deletion at position 35,699,378-36,104,197 that included the distal end of CPNE3-exon 1 and continued to include the rest of the gene, the complete CNGB3 gene, and the first four exons of CNBD1, to end in the middle of intron 4. Numbered black lines represent exons. Figure is not drawn to scale.