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Graphical representation of selected muropeptides identified in P. aeruginosa PAO1. Typical muropeptide characteristics included monomers, dimers, trimers, and tetramers. Dimers were determined to be either 3–4 or 3–3 cross-linked between muropeptide monomers. Muropeptide modifications included amino acid substitutions in the fourth and/or fifth position of the peptide side chain, as well as the resultant muropeptide products after deacetylase or amidase activity.
