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Inner: Cell / plasma membrane
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Outer: Cell wall
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Peptidoglycan layer consists of glycan chains
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Glycan chains: linear strands of two alternating amino sugars
N-acetylglucosamine_ (Nag) N-acetylmuramic acid (Nam) -
Cross linking of these strands by peptide chains
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When reproducing and growing, bacteria must synthesize more NAG/NAM units to add. Transpeptidation is the final stage in cross linking of the linear glycan chains.