Physicochemical characterization of nanoconjugates. A. SEC-HPLC chromatography of IR700, 8PEG-IR700 conjugates, and RGD-8PEG-IR700 nanoconjugates (λ = 689 nm), as well as BSA and IgG (λ = 280 nm). B. Particle size distribution of RGD-8PEG-IR700 nanoconjugates determined with DLS. C. Singlet oxygen generation of IR700, 8PEG-IR700, and RGD-8PEG-IR700.