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The universal bacterial signal molecule autoinducer-2 (AI-2) is derived from 4,5-dihydroxy-2,3-pentanedione (DPD). DPD exists in a complex equilibrium between multiple forms, and NMR spectroscopy has now been used to establish that the extent of the structural diversity displayed by DPD over a broad pH range is even greater than previously posited.  相似文献   

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