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(a) dN/dS ratios based on all branches of the tree for all subtypes/CRFs in pol (white squares) and env (gray diamonds) and standard deviation of each estimate. (b) dN/dS ratios based only on internal branches of the tree for all subtypes/CRFs in pol (white squares) and env (gray diamonds). dN/dS ratios were calculated from the global dN and dS absolute estimates of each of 200 analyzed trees.
