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The glycan chain consists of β- 1,4- linked monomers of N-acetyl glucosamine (GlcNAc) and N-acetyl muramic acid (MurNAc). The stem peptide contains amino acids L-Ala, D-iGln, L-Lys and D-Ala. This peptide is cross-linked to an opposite stem peptide on a separate glycan polymer through a pentaglycine (Gly5) interpeptide bridge. Arrows indicate the bonds targeted by the lytic proteins.
