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(a) Endothelial progenitor cell growth from 1 to 7 days (PLCL-W, control without biomolecules; 15Hep, 15 wt% heparin; 10, 20 and 30 vascular endothelial growth factors (VEGF) represent 10, 20 and 30 μg/mL of VEGF) and visual detection of the cells via (b) immunofluorescent microscopy (scale 200 µm) and (c) scanning electron microscopy (SEM, scale 100 µm) (adapted with permission from [162]).
