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The origin of tetrapods has not been resolved for decades. Three principal hypotheses (lungfish-tetrapod, coelacanth-tetrapod, or lungfish-coelacanth sister group) have been proposed. We used the Bayesian method under the coalescence model with the latest program (BEST) to perform a phylogenetic analysis for seven relevant taxa and 43 nuclear genes encoding amino acid residues with the jackknife method for taxon sub-sampling. The results, combined with those of other three genome-scale approaches, successfully prove the hypothesis that lungfishes and coelacanths form a monophyletic sister group and are equally related to tetrapods supported by high Bayesian posterior probabilities of the branch (a lungfish-coelacanth clade) and high taxon jackknife supports.

Genome-scale approach proves that the lungfish-coelacanth sister group is the closest living relative of tetrapods with the BEST program