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Effect of radiosurgery on cell viability. Mitochondrial metabolic activity of human cerebral microvascular endothelial cells was determined by MTT assay as an indicator of cell viability following radiosurgery at 0, 5, 15, or 25 Gray at 6, 12, 24, 72, and 120 hours. *P < .05 versus 0 Gray by paired comparison at the same time point.
