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Fig. 9. (A) Grafting density of heparin on different coatings (n = 3), *p < 0.05 vs. PP-DA-H. (B) The TT and APTT of PP-DA and PP-DA/PEI with different molecular weights of PEI (n = 3). The TT (C) and APTT (D) of heparinized coatings (n = 3). *p < 0.05 vs. control, #p < 0.05 vs. PP.