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Proliferation activity of Colon 26 cells after 48 hours of cultivation of the cells in the presence of GO and GO-NH2 nanoparticles: (a) Colon 26 cells grown in a media supplemented with increasing concentrations of pristine GO; (b) Colon 26 cells grown in a media supplemented with increasing concentrations of aminated GO-NH2 (asterisks ∗ denote p < 0.05 when the tested probes are compared to untreated control cells).
