Additional file 1.

Goodness of fit for different codon evolution models and estimated parameter values. Notes: P refers to the number of parameters in the x distribution; x is the selection parameter. pn is the proportion of sites falling within the xn site class. For models M7 and M8, p and q denote the shape parameters of the b function. Positively selected sites were identified in models M2a and M8 using the Bayes empirical Bayes procedure [67]. Sites inferred to be undergoing positive selection at the 95% and 99% confidence interval level are marked with * and **, respectively.

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Zhao et al. BMC Evolutionary Biology 2013 13:113   doi:10.1186/1471-2148-13-113