 In the strictest sense, "sabino" refers to the white patterns produced by the "Sabino 1" (SB1) gene, for which there is a DNA test.However, other horse enthusiasts also refer to patterns that are visually similar to SB1 as "sabino", even if testing indicates the gene is not present.Use of the term to describe non-SB1 "sabino" patterns in breeds that apparently do not carry the gene is hotly debated by both researchers and horse breeders.