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Detection of selection pressure on all module genes. Ka/Ks valuesare the nonsynonymous/synonymous substitution rate ratios; Conserved indicates gene sequences that are conserved and none snp detected; 0, Ka/Ks = 0; 0–0.1, 0 < Ka/Ks < 0.1; 0.1-1, 0.1 < Ka/Ks < 1; >1, Ka/Ks > 1; 99, Ka/Ks = 99. Genes with Ka/Ks ratios equal to 99 were not included in the 7% of genes with Ka/Ks ratios > 0.1 because estimates of omega equal to 99 are not reliable.
