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The amino acid sequence homology of the feline SLC3A1 gene among species and the site of missense mutation and polymorphism (box). The mutation and polymorphism identified in a cystinuric cat indicated in boldface. The conserved areas among mammals are shaded. Arg and R, arginine; Trp and W, tryptophan; Ile and I, isoleucine; Val and V, valine.
