Fig. 2
The numbers of genetic changes acquired by clones (one clone per culture) after 700 generations of evolution at pH 7.5 (weak nitrite [NO2−] toxicity, weak interdependence). The horizontal bars and P-values indicate the outcomes from two-sample Wilcoxon rank-sum tests. Data are presented as Tukey box-plots. The numbers of genetic changes include synonymous and non-synonymous point mutations, insertions, deletions, and multiplications. There are no statistical differences in the numbers of acquired genetic changes between the completely denitrifying clones and the nitrite producing or reducing clones