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. 2021 Apr 19;38(8):3247–3266. doi: 10.1093/molbev/msab099

Fig. 2.

Fig. 2.

Base composition at mutational equilibrium (GCeq) explains most of the variation in the relative frequencies of synonymous codon usage (with both frequencies on a log2 scale). The solid line represents the best-fit relationship (from a regression of observed frequencies on expected, where intercept = 0.1 slope = 1.15), whereas the dashed line indicates the 1:1 relationship.