Dominant white is best known for producing pink-skinned all-white horses with brown eyes, though some dominant white horses have residual pigment along the topline. Dominant white has been studied in Thoroughbreds, Arabian horses, the American White horse, the Camarillo White horse, and several other breeds. There are 27 identified variants of dominant white as of 2017, plus sabino 1, each corresponding to a spontaneously-white foundation animal and a mutation on the KIT gene. Researchers have suggested that at least some forms of dominant white result in nonviable embryos in the homozygous state, though others are known to be viable as homozygotes. While homologous mutations in mice are often linked to anemia and sterility, no such effects have been observed in dominant white horses. Dominant white horses typically have white noses that can be subject to sunburn.