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In vitro intracellular distribution and cell-uptake efficiency. (A) Intracellular distribution of HA-P-PEI/CY3-siRNA nanoparticles in H1975 cells at 4 h. Red, fluorescence-siRNA; blue, Hoechst 33342. (B) The uptake efficiency of HA-P-PEI/FAM-siRNA nanoparticles in H1975 cells at 4 h.
