PTP phylogenetic tree. Unrooted PTP phylogenetic tree obtained from Bayesian inferences and Maximum Likelihood method. The numbers indicate the values of Bayesian posterior probabilities followed by the bootstraps values of Maximum Likelihood of the clades. Values below 50 are not indicated. Bootstrap values inside groups of orthologs are not shown for simplification. Sequence names are given in abbreviated form. For clarity only the names of the genes outside the main clades and those described in the analyses of duplications are indicated (the names of other genes can be visualised in Additional file 1). Color codes are those used in the duplications analyses (Figures 2 and 3, Additional files 3 and 4). PTP organization in clades 1-4 can be seen in detail in Figures 5 and 6.