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Gray horses have the most common "white-like" coat color. However, the most noticeable difference between a gray horse whose hair coat is completely white and a white horse is skin color: most gray horses have black skin and dark eyes, white horses have light, unpigmented skin. The gray gene does not affect skin or eye color, so grays typically have dark skin and eyes,
as opposed to the unpigmented pink skin of true white horses.
The skin and eyes may be other colors if influenced by other factors such as white markings, certain white spotting patterns or dilution genes. Gray foals may be born any color, but the colored hairs of their coat become progressively silvered as they age, eventually giving mature gray horses a white or nearly-white hair coat. Gray is controlled by a single dominant allele of a gene that regulates specific kinds of stem cells. Gray horses are at an increased risk for melanoma; 70-80% of gray horses over the age of 15 have a melanoma tumor
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