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Effect of fractionated whole brain irradiation on mRNA expression of TNF-α and MCP-1 in mouse brain. Compared with sham-irradiated controls, fractionated whole brain irradiation significantly up-regulated mRNA expression levels of TNF-α (A) and MCP-1 (B) in mouse brain. Data represent means ± SEM for each group (n=4). **p<0.001 compared to control.
