Expression of thymidine kinase mediated by a novel non-viral delivery system under the control of vascular endothelial growth factor receptor 2 promoter selectively kills human umbilical vein endothelial cells

Figure 3 Immunofluorescence study of cultured human endothelial cells. A: Shows immunofluorescence positive-stained cells treated with Factor VIII related antigen. The cells were stained brown (× 400); B: Shows positive-stained cells in vitro treated with DiI-Ac-LDL. More than 95% HUVECs are found to be red fluorescence (× 400).