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Uptake of fluorescein-labeled PEG-fMLF nanocarriers derived from Nektar PEGs or peptide–backbone (PB-)PEGs in differentiated U937 cells after 4 h of incubation at 37 °C. The means ± SD for three independent experiments are shown for each value. (*, statistically significant difference between the control PEG5k and PEG-fMLF nanocarriers, p < 0.01.)
