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Confocal fluorescence images of living HeLa cells incubated with FPNPs of 0 μg mL−1, (b) 50 μg mL−1, (c) 100 μg mL−1 and (d) 500 μg mL−1. Incubation was performed at 37 °C under a humidified atmosphere containing 5% CO2. The fluorescence was determined at 488 nm with excitation at 405 nm.
