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Laser scanning confocal microscopy (LSCM) images of MGC803 cells with FA receptor (A) and GES without FA receptor (D) cultivated with UCNP-FA nanocomposites (200 μg/mL) for 1 h at 37 oC. Images (B) exhibit the cells incubated by the UCNP@SiO2-NH2 and images (C) show competition experiments in which MGC803 cells were incubated with excess free FA and UCNP-FA nanocomposites under the same conditions. All pictures were taken under the identical instrumental conditions.
