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Negative-ion mode MALDI-TOF MS mass spectra of lipid A from colistin-susceptible and colistin-resistant A. baumannii strains ATCC 19606, ATCC 19606 (pmrAP102R, miaAI221V), ATCC 19606 (pmrAP102R), ATCC 19606 (pmrAI13M), and ATCC 19606 (pmrBQ270P). The insets show partial enlarged views to display the ions at m/z 2,033.
