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MALDI-TOF mass spectra of DurM- and DurX-modified His6-DurA mutants in E. coli. Peaks corresponding to dehydrated products are highlighted in yellow, and peaks corresponding to dehydrated and hydroxylated products are indicated in green. The star indicates a peak resulting from laser-induced deamination, which occurs as a consequence of analyzing large peptides by MALDI-TOF MS in reflector mode.
