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Structure of S. aureus lipoteichoic acid. S. aureus LTA is composed of linear polyglycerolphosphate chains (average length, 23 repeating units), which are linked to a membrane anchor composed of Glc2-DAG (shaded box). Position 2 (indicated by X) of the repeating glycerolphosphate subunits can be unsubstituted (hydrogen), esterified with d-alanyl, or linked to N-acetylglucosamine (NAG). The diagram was adapted from previously published schemes (12, 35).
