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a The effect of PBS and b GdF3:2.5 %Ce3+,2.5 %Tb3+ (5 mg/mL, 1 h, 37 °C) on human erythrocytes, as observed using a transmission electron microscope. The agglomerates of nanoparticles attached to the erythrocytes membrane (b, black arrows) and the single nanoparticles inside of erythrocytes (b, white arrows) were observed
