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Stimulation of hydrogen-dependent caffeate reduction by sodium ionophores. Cell suspensions (1.25 mg of protein/ml) were treated as described in the legend to Fig. 2. At the time indicated by the arrow, one cell suspension received the protonophore SF6847 (○) (final concentration, 27 μM), and another received the sodium ionophore ETH2120 (□) (final concentration, 27 μM). The control (•) received the solvent only.
