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Measurement of capacitance step in prestin transfected HEK cell. Under voltage clamp a step voltage from +50 mV to +30 mV evoked a step increase in capacitance of 30 fF. Cm noise: 5.5 fF rms. PC clone, Axon 200B amplifier in resistive feedback mode, 10-kHz Bessel filter, and National Instruments (Austin, TX) PCI-6052E A/D D/A board were used.
