Fig. 4From: Functional characterization of biodegradable nanoparticles as antigen delivery systemIntracellular NP distribution evaluated by fluorescence microscopy. Hepa 1–6 (a and c) and monocytes (b and d) were loaded with either 50 μg/mL PLGA-Rhod NPs (a and b) or PLGA-Rhod/PEI NPs (c and d) at different time points. Original magnification: 400XBack to article page