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A. Representative images of formazan production in U87 MG cells in the absence and presence of 100 μl/ml Gd1 (Gd2O3/SBA-15) and Gd2 (Gd2O3/SBA-15/5FU) nanoparticles detected 24 h after their administration. B. Production of formazan (related to the viability of cells) in U87 MG cells in the absence and presence of 10, 50 and 100 μl/ml of Gd1 and Gd2 nanoparticles.
