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An illustration of how eukaryotic S18 consensus gene tree is evolving inside the eukaryotic species tree from an ancestral S18 protein. An ancient gene duplication is proposed in the stem of species tree by the reconciliation. Also, three gene duplications are proposed in the metazoan branch, which gave rise to modern day S18-1, S18-2 and S18-3 proteins in placozoa and eumetazoa clades.
