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Phylogeny of fgf genes. Phylogenetic analysis of vertebrate fgf receptors (A), fgf8/17/18/24 (B) and fgf9/16/20 (C) families using PhyML (upper values) and Mr. Bayes (lower values). For analysis the coding regions of fgf genes cDNAs were used. The position of the X. helleri orthologs of fgfr1, fgf24 and fgf20a within the three phylogenies is highlighted (red box).
