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pH dependence of succinate and butyrate transport. (A) The initial uptake of [14C]succinate by succinate-grown cells of P. lemoignei was measured at various pH values. (B) The rates of succinate transport were calculated from the slopes. Additionally, the specific transport rates of [14C]butyrate (2 μM labeled and 100 μM unlabeled butyrate) by succinate-grown cells are shown.
