Fig. 1From: Response of neuroblastoma cells to RF currents as a function of the signal frequencyTrypan Blue assay for cell viability as a function of the signal frequency. Samples were exposed to 5-min pulses of a 50 μA/mm2 current density applied every 3 h 55 min, or sham-exposed, for a total of 24 h. Data are means ± SEM of at least 3 experimental repeats, normalized over the respective controls. *: 0.05 > p ≥ 0.01; ***: p < 0.001; Student’s t-testBack to article page