The bootstrap consensus tree of PL10 homologous sequences. The evolutionary tree was built based on the Neighbor-Joining method implemented in MEGA4 [55, 62]. The bootstrap consensus tree is inferred from 1000 replicates and the branches corresponding to partitions reproduced in less than 65% bootstrap replicates are collapsed. The bootstrap values are shown as percentages next to the branches. The evolutionary distances were computed using the Maximum Composite Likelihood method  and in the units of the number of base substitutions per site. The rate variation among sites was modeled with a gamma distribution (shape parameter = 0.91). All positions containing alignment gaps and missing data were eliminated by pairwise deletion. A total of 3944 positions were in the final dataset [Additional File 6]. The branches leading to the non-annotated autosomal homologous clusters of PL10 are highlighted in blue; the branches leading to the rodent Pl10 are highlighted in green; the branches leading to the non-annotated X-homologs are highlighted in red. The PL10/DDX3X cluster and the DDX3Y cluster are marked by vertical lines on the right.