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Vascularization within porous PU discs after subcutaneous implantation for 10 days. Representative micrographs of CD31 immunostained explants of uncoated PU discs (A) and heparin-coated PU discs (B) and heparin-coated discs loaded with VEGF (C) or VEGF and PDGF-BB (D) (bar represents 50 μm). Vessel ingrowth was quantified for both vessel density (E) and percentage of ingrowth area vascularized (F) (n=8). Color images available online at www.liebertonline.com/tea
