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Cell association of Cy5-labeled capsules and HeLa cells for 6 (a) and 24 h (b). Cell association of Cy5-labeled capsules and U87 MG cells (c) and HeLa cells (d) for 12 h, respectively (* p < 0.05, ** p < 0.01, *** p < 0.001, and **** p < 0.0001). Error bars represent the standard deviation from three replicate experiments.
