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Energy dependence experiments: red fluorescent intensities of internalized HA/CS-RhB NPs after 90 min of incubation at 37 °C and 4 °C. HAs with different Mws were used: 280 kDa (yellow bar), 540 kDa (green bar) and 820 kDa (blue bar). Results are shown as mean ± SD. **** p value < 0.0001.
