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Chemical structures of guanosine triphosphate (GTP), guanosine diphosphate (GDP), guanosine pentaphosphate (pppGpp), and guanosine tetraphosphate (ppGpp) molecules. The pyrophosphate group of pppGpp and ppGpp at the 3' hydroxyl (OH) position is transferred by the (p)ppGpp synthetase from another purine nucleotide ATP.
