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The Na+/H+ exchanger isoforms NHE1, NHE2, and NHE3 were all found to be expressed in Ehrlich ascites tumor cells, as evaluated by Western blotting and confocal microscopy. Under unstimulated conditions, NHE1 was found predominantly in the plasma membrane, NHE3 intracellularly, and NHE2 in both compartments. Osmotic cell shrinkage elicited a rapid intracellular alkalinization, the sensitivity of which...