Figure 4: Microphotographs of DPS and MCF-7 cells after 24 hours of incubation with WO3 nanoparticles (0.2–200 μg/mL). Cells were plated in 96-well plates and left overnight. Then, WO3 nanoparticles (0.2–200 μg/mL) were added, and after 24 hours, cells were stained with an L-7007 LIVE/DEAD kit.