1x10^6 HUVEC cells were intracellularly stained with 0.8 ug CoraLite® Plus 488 Anti-Human VEGFR2/KDR (CL488-67407, Clone:1G2A8)(red), or 0.8 ug CoraLite® Plus 488 Mouse IgG1 Isotype Control (MOPC-21) (CL488-65124, Clone: MOPC-21) (blue). Cells were not fixed.