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RBC-NP distribution in organ slices 48 h post intravenous injection. (A) Confocal microscopy images of four different-sized RBC-NPs in liver, spleen and kidney slices. Red represents RBC-NPs. Blue represents cell nuclei. Green represents blood vessels. (B) Fluorescence intensity of four different-sized RBC-NPs in liver, spleen, and kidney slices. ** p < 0.01 compared with 200 nm. ## p < 0.01 compared with 160 nm. Δ p < 0.01 compared with 120 nm.
