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The estimated η varies among 90 clades sampled across the tree of life. Each clade is represented by an alignment of genome-wide orthologous coding sequences of two closely related species/strains. Statistical significance of η’s deviation from 1 is determined by an adjusted P value of <0.05 (likelihood ratio test followed by Bonferroni correction for multiple testing). Clade indices on the x-axis refer to those in supplementary table S1, Supplementary Material online.
