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Cell growth and polyP accumulation during the nutritional downshift. E. coli MG1655 (wild type) and CF5802 (ppk ppx mutant) cells were subjected to the nutritional downshift from the 2 × YT to the Mops medium. PolyP accumulated in response to the downshift in the wild type (open circle) but not in the mutant (open square). Growth was measured as the optical density at 600 nm (OD600) in the wild type (filled circle) and the ppk ppx mutant (filled square).
