Fig. 4From: Comparison of cytotoxicity of black phosphorus nanosheets in different types of fibroblastsOptical microscope images of a NIH3T3 fibroblast, b nHDF fibroblast, and c HT1080 fibrosarcoma cells cultured with BPNSs (0–125 μg/mL) after 24 h. The control was the cell line without any additives (0 μg/mL). The scale bar represents 200 μm. The arrow indicates aggregated nanosheets outside the cellBack to article page