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. Author manuscript; available in PMC: 2013 Sep 3.
Published in final edited form as: Biomaterials. 2012 Jul 6;33(28):6709–6720. doi: 10.1016/j.biomaterials.2012.06.017

Fig. 4.

Fig. 4

(A) Schematic illustration of experimental set-up for bioactivity test using Transwell® system. (B) Bioactivity of PDGF-BB released from the passively adsorbed scaffolds (PDGF) and the heparin-conjugated scaffolds (PDGF-HC). Tissue culture plates (TCP), unconjugated scaffolds (control) and the heparin-conjugated scaffolds (HC) without PDGF-BB were included for comparison. Statistical difference between day 3 and day 7 (*P < 0.05 and **P < 0.01) and comparison with control (+P < 0.05 and ++P < 0.01).