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Mice were exposed to 900 MHz (GSM) for 60 minutes either 1 day at an SAR of 4 W/kg, or for 2 years (60 minutes / day, 5 days / week for 104 weeks) at SARs of 0.25, 1.0, 2.0 and 4.0 W/kg. Analysis of hippocampal neurons in mouse brain, including the well defined pyramidal and granular layers, suggested no effects of RF exposure. Specifically, there was no affect on dark cell change as had been earlier reported by Salford et al (Environment. Health Persp. , 2003, http://ehp.niehs.nih.gov/docs/admin/newest.html#1_26) |