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(+)Nano-ESI-QTOF mass spectrum of glycopeptides belonging to the peptide ATLTSADVIRVD derived from the S-layer glycoprotein of G. stearothermophilus NRS 2004/3a. The most abundant peaks derive from overlapping peaks of the two molecular ion series [M + 3H+K]4+ and [M + 2H+2Na]4+; all glycopeptides carry a single glycan chain attached to serine-794. The number of repeating units (RU) varies between 13 and 17.
