Fig. 4From: Polyethylenimine-Based Amphiphilic Core–Shell Nanoparticles: Study of Gene Delivery and Intracellular TraffickingCellular internalization and nuclear localization of FITC-labeled PMMA–PEI nanoparticles in HeLa cells. Cells were incubated with the nanoparticles for 20 min, 1 h and 2 h, respectively. Cells with nuclear fluorescence are indicated by the arrowsBack to article page