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Total cellular association (uptake from now on) of fluorescein-labeled PEG-fMLF nanocarriers in the undifferentiated and the differentiated U937 cells at 37 °C after 4 h of incubation. The means ± SD for three independent experiments are shown for each value. (*, statistically significant difference between undifferentiated and differentiated U937 cells, p < 0.01.)
