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Intracellular Glutathione Content in 24- and 72-Hour Exposure time to 10, 50, 100 and 250 µg/ml Concentrations of A-SiO2 Nano and Microparticles. (Results of mean ± SD of GSH concentration per mg of cell's protein from three experimental tests). * † Significant statistical differences; 1) between experimental groups compared to control and 2) between comparative experimental groups exposed to micro- and nano-sized particles (p-value <0.05)
