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Positively selected codon sites with hypothetical amino acid replacements predicted by the NEB and BEB approaches of the Bayesian method. The composite phylogenetic tree is based on the three sources (Price et al. 2005; Koito et al. 2010; McGowen 2011) and the sources of their nucleotide sequences are given in Table S1. *significant at the 5% level. ** significant at the 1% level.
