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The chemical reactions and pathways resulting in the breakdown of wall teichoic acid, which is a major component of the cell wall of Gram-positive bacteria and typically consists of a polymer of glycerol-phosphate or ribitol-phosphate to which are attached glycosyl and D-alanyl ester residues and which is covalently linked to peptidoglycan. [GOC:add, PMID:14665680]
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