Results of codon-based test of positive selection, averaging over all sequence pairs.

*Some of the pairwise comparisons (for examples, see Tables S5, S6, S7) showed significant values (probability less than 0.05, indicating positive selection). These significant values are reflected in higher overall average values of the Z statistic and the lower values of probability. Representative paralog groups were included in this analysis. The identifier of the first sequence is shown in the table, and the remaining paralogs in each group were selected based on the criteria outlined in the methods section. The probability of rejecting the null hypothesis of strict-neutrality (dN = dS) in favor of the alternative hypothesis (dN>dS) is shown (in the probability column). Probability values less than 0.05 are considered significant at the 5% level. The Z statistic (dN - dS) is shown in the Stat column. dS and dN are the numbers of synonymous and nonsynonymous substitutions per site, respectively.