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Negative-ion MALDI-TOF mass spectrometry spectra for lipid A isolated from Y. enterocolitica serotype O:8 grown at 21°C (A) or at 37°C (B). Proposed structures corresponding to major peaks and acyl group positions follow previously reported structures for Yersinia and other Gram-negative bacteria. The results in both panels are representative of three independent lipid A extractions.
