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Primary newborn rat glial cells (~70% astroglial and ~30% microglial) were exposed to 900 MHz (GSM, CW) for 4, 8, or 24 hours at either 3 W/kg (using a mobile phone as an exposure source or 27 and 54 W/kg (using a waveguide as an exposure source). Exposure at either low or high SAR did not result in any changes in Ffap, ED1, IL-6, Tnfa, and other markers. In contrast, heat alone (elevation of temerature by 1 degree C) did result in significant changes. The authors suggest that prior effects reported on similar endpoints may be a result of thermal artifacts. |