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Patterns of convergent adaptive amino acid replacements. The phylogeny of the sampled species is indicated on the left, with species names abbreviated as in supplementary table S1, Supplementary Material online. Branches leading to C4 species in red. Amino acids at some of the sites under positive selection (*P < 0.05; **P < 0.01) are indicated on the right. Residues of co-opted genes are highlighted with a blue background.
