Volcano plots for relative protein abundance changes measured by mass spectrometry in E. coli (left) and D. radiodurans (right) after irradiation using the same biological replicates as in Fig 2A. Black-circled points are those proteins with significant changes (paired, 2-sided t-test p-value < 0.05) of >2-fold or <0.5-fold. Red points are proteins with at least one carbonylated peptide detected. Fold change and p-value cutoffs considered for significance are indicated by dashed lines. 