Reduction of intracellular pH by inhibitors of natural killer cell activity, nicardipine, methyl 2-(N-benzyl-N-methylamino)ethyl-2,6-dimethyl-4-(2-isopropyl-pyrazolo[1, 5-a]pyridine-3-yl)-1,4-dihydro-pyridine-3,5-dicarboxylate (AHC-52), and 4,4'-diisothiocyano-2,2'-disulfonic acid stilbene (DIDS).

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