APP and neuroblastoma: Interestingly, when HT22 mouse hippocampal neuronal cells and SH-SY5Y human neuroblastoma cells were exposed to 1,950 MHz [58] with a high-power SAR of 6 W/kg for two hours per day for 3 days, the levels of APP, Aβ precursor protein cleaving enzyme 1, disintegrin metalloproteinase 10, and presenilin-1 were not significantly different between EMF exposed culture and controls exposures.