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A. The three-dimensional structure of PIP. PIP is composed of seven β-sheets. The potential N-glycosylation site is at position Asn77. The tertiary structure of this protein contains two disulphide bridges formed between Cys37 and Cys63 and Cys61 and Cys95 [105,106]. B. The amino acid sequence of PIP and localization of fibronectin (FN)- and CD4-binding domains [60-62].
