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Cell walls which stain positive are Gram positive. They consist of peptidoglycan (murein) and are more thick than peptidoglycan in Gram negative bacteria. The cell walls of Gram positive bacteria also possess teichoic acids which are of two types (1) lipoteichoic acid and (2) wall teichoic acid. The teichoic acid gives the cell wall antigenic specificity, the characteristic of which is also used to identify bacteria in serological tests.

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