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The disaccharide moiety is composed of the amino sugars N-acetylglucosamine (GlcNAc) and N-acetylmuramic (MurNAc) linked via a β-1,4 glycosidic bond. The amino acid at position 3 of the stem peptide is meso-diaminopimelic acid (R = COOH) in most Gram-negative bacteria and l-lysine (R = H) in most Gram-positive bacteria.
