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Peptidoglycan is used in bacterial cell walls. It can be made visible by gram staining in gram positive bacteria.

Chemical structure

The peptidoglycan layers in the bacterial cell wall consist of a lattice structure of two overlapping sugars, namely N-acetyl glucosamine (NAG) and N-acetyl muramic acid (NAM), that are interlinked by amino acids. The exact structure varies with the species.

Biological purpose