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Fig. 3
Branch lengths are scaled to the expected number of substitutions per nucleotide, and branch colours indicate the strength of selection (dN/dS or ω). Red, positive or diversifying selection (ω>5); blue, purifying selection (ω = 0); yellow, neutral evolution (ω = 1). Thick branches indicate statistical support for evolution under episodic diversifying selection. The proportion of each colour represents the fraction of the sequence undergoing the corresponding class of selection.
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