Figure 5 .

Cellular uptake of particles as studied by confocal fluorescence microscopy. Cellular uptake of uncoated rods (a and b) and spheres (c and d) vs PEI-functionalized S-MSPs (e and f) (spheres) in HeLa cells after 4 h incubation, resulting in different intracellular distribution patterns. All images are confocal sections thorough the nucleus.