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Original traces of fluorescence microscopy experiments with Madin-Darby canine kidney (MDCK)-C11 cells. The records show the recovery of pHi along 2 min after an acid pulse with NH4Cl. The figure shows 3 different conditions. A: control solution with 135 mM Na+. B: 0 Na+ solution. C: 1 μM UGN added to the 0 Na+ solution.
