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Inorganic phosphate (Pi) efflux from cells of L. lactis subsp. cremoris HP (A), L. monocytogenes Scott A (B), and B. subtilis ATCC 6051 (C). Symbols: □ and ▵, intracellular Pi concentrations in unenergized and energized cells, respectively; ▪ and ▴, extracellular Pi concentrations in unenergized and energized cells, respectively. Data points represent the average of at least two experiments done in duplicate.
