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(A) Box plot for the distribution of dN/dS values of genes on avian macrochromosomes, microchromosomes, and the Z chromosome. P values were calculated with Wilcoxon rank sum tests. (B) GO categories in Neoaves, Galloanserae, and Palaeognathae showing clade-specific rapid evolutionary rates. Red bars, P value of significance; blue bars, number of genes in each GO.
