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(A and B) Numbers of cysteine residues in various keratins. Cysteine residues were counted in all new anole and chicken keratins and in all human hair keratins. For mammalian non-hair keratins, only representative examples are shown. The black portion of each column indicates the number of cysteines in the central domain of the keratin protein. Note that the cysteine counts of aHAS1, aHAS2, and aHAS4 do not contain the as-yet uncharacterized tail domains.
