Figure 4From: Effect of single-walled carbon nanotubes on tumor cells viability and formation of multicellular tumor spheroids Multicellular tumor spheroids culture at different concentrations of SWCNTs. (A) Control. (B) 12.5 μg/ml. (C) 25 μg/ml. (D) 50 μg/ml. (E) 100 μg/ml. (F) 150 μg/ml. (G) 200 μg/ml. ×80 magnification.Back to article page