SOX9 and disorder of sexual differentiation: When considering the 32 SNPs spanning the peak of the CFA9 region, this 4.27MB region overlaps the canine ortholog for the upstream regulatory region of human SOX9 [38,39] and the canine ortholog for human XX DSD (Online Mendelian Inheritance in Man, OMIM 278850, hg38 chr17:69100001–76800000).