Figure 2
From: Positive selection for unpreferred codon usage in eukaryotic genomes
Kp/Ku is directly correlated with codon bias, here measured using the ENC' statistic ([49]; lower ENC' prime values indicate higher codon bias) in (A) Cryptococcus, (B) Saccharomyces, and (C) Drosophila. Error bars indicate standard error. This relationship suggests that recent selective pressures on codon usage in these groups generally reinforce historic selective pressures.