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In PvAMT1;1H211E, ammonium does not cause cytoplasm acidification. Changes in cytoplasmic pH (top) and membrane potential (bottom) in an oocyte expressing PvAMT1;1H211E exposed to 1 mm NH4+ at pH 7.0. Representative records are from 4 to 6 oocytes from 2 to 3 frogs.
