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.
Eirín-López et al. BMC Evolutionary Biology 2009 9:31 doi:10.1186/1471-2148-9-31