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Effect of HOTAIR overexpression on tumor growth in mice bearing HeLa cells and exposed to radiation. Mice bearing HeLa cells were divided into four groups: Len-GFP, Len-HOTAIR, Len-GFP+ radiation and Len-HOTAIR+ radiation. (a) The tumor growth was measured in these mice. (b) The expression of HOTAIR in these mice. (c) The protein level of HIF-1α in these mice. **vs Len-GFP, P < 0.01; ##vs Len-GFP + radiation, P < 0.01. All the experiment performed in triplicate
