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. 2019 Dec 10;37(4):982–993. doi: 10.1093/molbev/msz279

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© The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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FIg. 2. — Comparative analysis of the type II keratin gene cluster in terrestrial vertebrates. (A) Map of the type II keratin gene clusters in representative species of the main clades of terrestrial vertebrates. Genes are symbolized by arrowheads that point in the direction of transcription. Putative orthology is indicated by equal colors. Note that KRT18 encodes a type I keratin. (B) Cysteine counts of proteins encoded by the genes shown in panel (A). An asterisk over snake HBS2 indicates that only an incomplete amino acid sequence was available and the number of cysteine residues is probably higher than indicated. Alligator K78LT has 66 cysteine residues which is higher than the maximum value of this graph. Information about the species is provided in the legend of figure 1.