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Phylogenetic tree of insect frq homologuous genes. Bayesian phylogeny of insect homologues based on substitutions at synonymous positions. Arrows indicate the age of the Frq1-Frq2 duplication and of the common ancestor of Drosophila and Ceratitis Frequenins. The 95% high posterior density intervals of node ages are depicted in grey. Coloured shaded boxes denote the frq1 and frq2 subtrees. The ω values estimated in the ML analysis are also shown. Scale is in My.
