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Optimal phylogeny for SMXL family. Maximum likelihood (ML) tree with the amino acid dataset under the PROTCATJTTX model in RAxML. Topology rooted at the hornwort clade. a Phylogram, labelled to show the high-order relationships between the major clades. b Cladogram showing more detailed relationships between the clades listed in Table 2, with bootstrap values at key nodes. The fully labelled phylogeny is shown in Additional file 17
