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Schematic structure of L. lactis peptidoglycan and site of cleavage of YjgB. GlcNAc, N-acetylglucosamine; MurNAc, N-acetylmuramic acid. d-Ala residues at positions 4 and 5 of the acceptor peptide chains may be present or not, and d-Asp may be amidated or not, according to previous L. lactis peptidoglycan structural analysis (8).
