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The substrate of lysozyme is ______________, a carbohydrate found in many bacterial cell walls. Lysozyme cleaves the (β1→4) glycosidic C–O bond between the two types of sugar residues in the molecule, N-acetylmuramic acid (Mur2Ac) and N-acetylglucosamine (GlcNAc), often referred to as NAM and NAG, respectively,