Codon usage bias and effective population sizes on the X chromosome versus the autosomes in Drosophila melanogaster.

2010 ), means that caution must be used in interpreting the difference in K 0 / K 4 between X and A in the overlap region (0.172 for X and 0.152 for A in table 1 ) as evidence for faster adaptive evolution of nonsynonymous mutations on the X; the difference in K 0 is only marginally significant, whereas the difference in K 4 is highly significant.

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