Additional file 1.
Binned rates of synonymous substitution per site (Ks) of paralog α of gene fragments greater than 200 bp suggest that Ks is lower in the early stage than in the later stage. Ks values were calculated using a free ratio model on the phylogeny depicted in Fig. 1B in which Ks is estimated independently for each branch. The early stage of evolution (blue bars) corresponds with the paralog α lineage between node 1 and 3 and the later stage of evolution (red bars) corresponds with the XLα lineage between node 3 and XLα.
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Chain et al. BMC Evolutionary Biology 2008 8:43 doi:10.1186/1471-2148-8-43