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The effects of intracellular calcium buffering on electrical tuning were studied in hair cells at apical and basal cochlear locations tuned to 100 and 300 Hz. Ca2+ imaging revealed about twice as many hotspots of Ca2+ entry during depolarization in high-frequency compared to low-frequency hair cells. It is suggested that each KCa channel is gated by Ca2+ entry through a few nearby Ca2+ channels, and that Ca2+ and KCa channels occupy, at constant channel density, a greater fraction of the membrane area in high-frequency cells than in low-frequency cells Show
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