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Structure of Hp (heparin) (A) and HS (heparan sulfate) (B) reported from the shrimp Litopenaeus vannamei. The Hp structure consists of repeating units of predominantly α-d-iduronic acid 4-linked to N-acetyl α-d-glucosamine, also 4-linked. In HS, the uronic acid unit is mostly β-d-glucuronic acid.
