(A) Ovine PITX3 gene structure. (B) Electropherograms of the PITX3 c. 338G>C mutation. Representative sequence traces of PCR products amplified from genomic DNA of three sheep with the different genotypes are shown. (C) Multispecies alignment of the evolutionary conserved homeodomain of the PITX3 protein sequence. The p.R113P mutation in PITX3is indicated by an arrow. It affects an arginine residue, which is perfectly conserved from human to zebrafish across all investigated species. The sequences for the alignment were taken from the following accessions: (sheep, NP_005020 (human), XP_589431 (cattle), XP_001499185 (horse), EDL41981 (mouse), NP_062120 (rat), XP_421631 (chicken), NP_001082023 (Xenopus laevis), NP_991238 (Danio rerio).