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Comparison of synonymous substitution rate (dS) and nonsynonymous substitution rate (dN) among mitochondrial oxidative phosphorylation (mt OXPHOS), nuclear OXPHOS (nu OXPHOS), and non-OXPHOS genes in 7 fishes (A, B) and 40 mammals (C, D). Whisker-ends are at the 5th and 95th percentiles. *P < 0.05, **P < 0.01, ***P < 0.001.
