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Agarose gel electrophoresis of (1) EDC/s-NHS-activated VEGFR2, (2) QDs800-NH2 and (3) QDs800-VEGFR2 conjugate. DLS spectrum of (A) QDs800-PEG-NH2 (12.6 ± 3.6 nm) and (B) QDs-VEGFR2 conjugate (18.7 ± 5.3 nm). EDC = N'-ethylcarbodiimide, DLS = dynamic light scattering, PEG = polyethylene glycol, VEGFR2 = vascular endothelial growth factor receptor 2, QDs = quantum dots, NHS = N-hydroxysulfosuccinimide
