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Biochemical classification of PDG lysins: 1, amidases; 2, endopeptidases; 3, glucosaminidases; 4, lysozymes (or muramidases); 5, transglycosylases. The latter hydrolyze the β-1,4-glycosidic bond to form a 1,6-anhydro bond. GlcNAc, N-acetylglucosamine; MurNAc, N-acetylmuramic acid; m-DAP, meso-diaminopimelic acid.
