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Processed mosaic of a sagittal section through the brain of mouse model of glioma. To produce transformed cells, creGFAP mice were injected in the cortex with Ras/s.i.p53 virus and perfused after 2 weeks. In this system, GFP is introduced by the virus and expression is induced by an IRES site in the mRNA. Thus, the GFP gene is expressed whenever the virus infects a cell expressing GFAP (green). The section was immunolabeled for nestin (red) and counterstained with DAPI (blue).