 Due to the large number of horses that had these patterns, as well as a significant number of double dilute creams also caught up by this rule, the American Paint Horse Association (APHA) formed, allowing these horses to be registered as "Paints".The APHA recognizes sabino as one of the "overo" family of color patterns.Since the relaxation of the white rule, at least one registered Quarter Horse has tested homozygous for the SB1 allele.