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Accumulation of ppGpp during the nutritional downshift. (A) ppGpp was detected on the polyethylenimine-cellulose/TLC plate in the wild type harboring pMW119 and the ppk ppx mutant harboring pMW119 or pMWppk. (B) Relative amounts of ppGpp were indicated as the intensity of ppGpp divided by that of ppGpp plus GTP.
