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A gram positive cell wall is a single layer that is 20-80 nm thick and makes up 50%-90% of the dry weight of the cell. Primarily composed of peptidoglycan containing a peptide interbridge. It does not possess an outer membrane. It usually contains large amounts of negatively charged teichoic acids, which helps to give the bacteria its negative charge, and may be important in maintaining the strength of the wall. Teichoic acids are polymers of glycerol and ribitol joined by phosphate groups. Teichoic acids are not found in gram negative bacteria.
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