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Fluorescent intensity measurement of FN coated on PLLA or PVAA-treated PLLA, with or without EDC coupling, as shown. (A) PLLA-FN, (B) PLLA-PVAA-FN, (C) PLLA-(EDC)-FN, and (D) PLLA-PVAA-(EDC)-FN. n = 4, *p < 0.05 compared with all the other groups.
