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DIGE analysis. Protein spots with changes in expression levels between wild-type and mutant strains are marked and identified by mass spectrometry (Table 1). The upper inserts show the presence of the trigger factor (tig) in both the wild-type and mutant strains. The insert below illustrates the presence of the HpaA protein in the gel from the wild type and the lack of HpaA in the corresponding area in the gel from the mutant.
