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Positive ion MALDI-TOF mass spectra of the muropeptide products derived from H. pylori wild type peptidoglycan. A, PG subjected directly to muramidase digestion. B, PG was chemically N-acetylated prior to muramidase digestion. Muropeptide peaks labeled by an asterisk correspond to N-deacetylated muropeptides that are shifted after chemical acetylation.
