Data were expressed as mean6standard deviation (SD). Statistic analyses were performed using Mann-Whitney U-test and Pearson correlation test. Figure S1 Expression of the endothelial-specific markers. Von Willebrand Factor (VWF) and CD31 (PECAM-1) were analyzed in 2 nd day HUVEC cultures by immunostaining with anti-CD31 (green) and anti-VWF (red). Nuclei were stained with DAPI (blue). Analysis was performed as described in Methods S1. (TIF)