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Fig. 2 | BMC Evolutionary Biology

Fig. 2

From: Comparative transcriptomic analysis revealed adaptation mechanism of Phrynocephalus erythrurus, the highest altitude Lizard living in the Qinghai-Tibet Plateau

Fig. 2

Divergence time and the ratio of Ka/Ks for the researched species. (a) Divergence time estimates for the major lizard clades generated using MCMCtree and the 4-fold degenerate sites. The red dots correspond to calibration points. Divergence time estimates (Mya) are indicated above the appropriate nodes; blue nodal bars indicate 95 % confidence intervals. (b) The box plot shows the ratio of non-synonymous to synonymous mutations (Ka/Ks) for P. erythrurus, P. putjatia, R. kukunoris and R. chensinensis branches

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