Fig. 3From: Exposure to 3G mobile phone signals does not affect the biological features of brain tumor cellsEffects of RF emission on the morphology and ultra-structure of human glioma cells. The morphology and ultra-structure of U251-MG (a) and U87-MG (b) cells were recorded after exposure for 12, 24, or 48 h. There were no significant differences between the control and treated groups. Scale bar, 100 μmBack to article page