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Evolution of centromeric histones in distinct taxonomic groups. a Cladograms of Tetrahymena, Mammals, Rosids, and Drosophila show rates of synonymous substitution (dS) as a gauge of divergence from T. thermophila, H. sapiens, A. thaliana, and D. melanogaster. b Amino acid positions under positive selection (Bayesian posterior probability >0.9) are shown for Rosids (triangles) and Mammals (circles). Amino acid site numbering is according to CenH3 from A. thaliana and H. sapiens
