Figure 1. Fluorescence micrographs of HA-CSO NP uptake (6 h). Fluoresceinamine-HA (green) and Cy3-plasmid (red) were evident in the cytoplasm of HCE and IOBA-NHC cells. Nuclei were counterstained with Hoescht dye (blue). Insets show higher magnification of cytoplasmic NPs. Representative images of four different experiments are shown. (Magnification 63×, inset magnification 252×).