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In vitro permeation of FPP across porcine epidermis on application of 120 V and 100 pulses at different pulse lengths (1, 10 or 100 ms) and frequencies (1 or 5 Hz). In case of control (passive permeation for 100 sec) experiments, detectable levels of FPP were not found when the studies were carried out for the same duration of time. Data expressed as mean ± SD (n = 3) (**P = 0.012, *P > 0.05).
