VEGF-R2 interacts with the βC-R. (A) CD34⁺ EPCs were treated with EPO (50 mU/mL) or VEGF (100 ng/mL) or mock-treated for 3 hours before fixation. Cells were stained with VEGF-R2 and βC-R antibodies before probing with secondary antibodies and imaging by confocal microscopy. (B) Spatial analysis of localization of βC-R and VEGF-R2 demonstrates colocalization.