Fig. 4.

Confocal microscope images of HUVEC interacted to QDs-VEGFR2 and QDs. Green fluorescence indicates QDs interaction to cells. QDs-VEGFR2 bound to HUVEC, while there was no QD binds to HUVEC without VEGFR2 conjugation.

A. HUVEC with QDs-VEGFR2. B. HUVEC with QDs only (left: overlaid image of DIC and fluorescent images, middle: green fluorescent [QDs] image, right: overlaid image of blue [DAPI] and green fluorescent images). HUVEC = human umbilical vein cord endothelial cells, DIC = differential interference contrast, DAPI = 4',6-diamidino-2-phenylindole, QDs = quantum dots, VEGFR2 = vascular endothelial growth factor receptor 2