Alternative accessible evolutionary paths.

<p><b>(A)</b> The fitness of beneficial mutations found (F) in Evolve and Resequence studies is significantly higher than the fitness of beneficial mutations not found (NF) in sulfate-limitation but not in glucose-limitation. The significance of the difference between the two boxplots for each condition was estimated using a Wilcoxon-ranked test. (<b>B)</b> Each point represents the fitness of a strain and the proportion of Evolve and Resequence samples with the corresponding gene mutated. <i>SUL1</i> dominates the fitness and mutational spectrum. Several mutations have a high fitness but have never been detected in Evolve and Resequence studies and might correspond to potential drivers of adaptation.</p>