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Evidence of Selection upon Genomic GC-Content in Bacteria

Figure 2

The infinite sites assumption.

The figure shows the predicted value of Z, allowing for a violation of the infinite sites assumption, assuming that base composition is due to mutation bias alone and base composition is stationary, plotted against GC4 under the (A) constant rate and (B) exponential rate models, along with the effect of removing this bias from the observed value (Z-Zpred) for the (C) constant and (D) exponential models.

Figure 2