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Potassium efflux consequent upon activation of KefB and KefC by NEM. K+ efflux was assayed in K0 medium with strain MJF274 as described previously (5, 11) using either 15 μM (▴) or 500 μM (●) NEM (arrow); the control incubations, with no addition, is indicated by the open symbols. The experiments have been replicated at least three times.
