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Comparison of the α-keratin gene family loci in amniotes. The chromosomal loci containing the type I (A) and type II (B) keratin genes of humans, anole, and chicken are schematically depicted. Genes are represented by arrows pointing in the 5′ to 3′ end direction. Black arrows represent homologues of hair keratins. Note that only 1 of a series of human keratin-associated protein (KAP) genes and 4 of 11 hair keratin genes at the human type I keratin gene locus are shown.
