Fig. 3. Uptake of PLNPs by RAW264.7 macrophages. Macrophages were treated with LPS (1 μg ml^–1) and PLNPs (125 μg lipid per mL) and incubated for 3 h at 37 °C. The images were taken with a fluorescence microscope (blue and red colors represent nuclei and DiD-labelled particles, respectively).