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Megavolt-per-meter field threshold and effect of pulse repetition rate on PS externalization. Flow cytometric fraction of cells binding annexin V (standard assay for PS translocation) with intact membranes (no propidium iodide influx) after 50-pulse exposures to 7-ns pulses at amplitudes (a) and pulse repetition rates (b) indicated on the x axes. Pulses in (a) were delivered at 20 Hz. Pulses in (b) were 2.5 MV/m.
