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LC/MS analysis of LamD558 in culture supernatant (sup.) of strain MSI011 (top) and chemically synthesized LamD558 (bottom). The extracted ion chromatogram at a m/z value of 559 was displayed for each analysis. The culture supernatant was prepared, and LC/MS analysis was performed as described in the legend to Fig. 5A. The synthetic LamD558 was prepared as described in Materials and Methods.
