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Figure 3 | BMC Evolutionary Biology

Figure 3

From: The evolutionary differentiation of two histone H2A.Z variants in chordates (H2A.Z-1 and H2A.Z-2) is mediated by a stepwise mutation process that affects three amino acid residues

Figure 3

Amino acid variation between H2A.Z-1 and H2A.Z-2 variants and selection for GC-rich and GC-poor amino acids. A Protein alignment of H2A.Z-1 (pink) and H2A.Z-2 (purple) from human showing the three amino acid differences between both sequences constituting the triresidue (yellow boxes). Asterisks denote matching positions in the alignment and the secondary structure for both variants is represented above the alignment indicating the N-terminal region, the histone-fold domain and the C-terminal region. B Relationship between GC-content and the frequencies of GC-rich (GAPW) and GC-poor (FYMINK) amino acid classes, and (C) between GC content and the frequencies of alanine and lysine residues in H2A.Z-1 (pink) and H2A.Z-2 (purple) variants.

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