Figure 1.

Amino Acid Alignment of β-keratins showing the 32aa Filament Segment of Feathers: Alignment of the two most diverged feather β-keratins from each chromosome of G. gallus and T. guttata. Annotation of the sequences includes the three letter abbreviation of the species, the chromosome number, type of β-keratin, and the number indicating position in the 5' to 3' direction on each chromosome. The 31 amino acids in the box comprise those described by Fraser and Parry [22] as the 32-residue segment constituting the filament framework of feather β-keratins. Both the G. gallus and T. guttata β-keratins possess a deletion in position 3 of the 32-residue segment.

Greenwold and Sawyer BMC Evolutionary Biology 2010 10:148   doi:10.1186/1471-2148-10-148
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