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Hypertonicity decreases K+ flux in control and fray knockdown tubules. K+ flux (pmol/min/tubule) was measured in control (w;c42-GAL4/+) and principal cell fray knockdown (yw/w;UAS-frayRNAi/c42-GAL4) tubules in standard bathing medium or hypertonic bathing medium (sucrose added to a final concentration of 0.1 m). n = 14–22 tubules/genotype/condition. K+ flux was decreased in hypertonic conditions in both control and fray knockdown tubules. *, p < 0.05; **, p < 0.01. Error bars, S.E.
