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Comparison of negative-ion MALDI mass spectra of B. pertussis LPS and lipid A. Results are shown for LPS isolated from the mutant BPM2859 (a) and the wild-type BP338 (b) strains and lipid A isolated from the mutant BPM2859 (c) and the wild-type BP338 (d) strains. The crossed peaks at m/z values of 1,349 in panels c and d correspond to a contaminant.
