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Characterization of the silica (SiO2) particles. (a) Representative transmission electron micrographs (TEM) of 920-nm-size SiO2-Cy5 (Cyanine 5) microparticles. (b) Representative TEM of 59-nm-size SiO2-BDP FL (BODIPY®-fluorescein) nanoparticles (NPs).
