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Cumulative release of VEGF from PLLA or PVAA-treated PLLA. FN was coated on these substrates by either covalent coupling via EDC or by passive adsorption. 
: PLLA-PVAA-(EDC)-FN-VEGF; 
: PLLA-FN-VEGF; 
: PLLA-PVAA-FN-VEGF; 
: PLLA-(EDC)-FN-VEGF. n = 4. *p < 0.05 compared with all the other groups at the same time point. VEGF, vascular endothelial growth factor.
