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Phylogenetic analysis of the (p)ppGpp synthetase domains of members of the RelA/SpoT family. The At-RSH1, 2, and 3 homologs and the E. coli and S. coelicolor RelA/SpoT proteins are shown in boldface type. At-RSH1, 2, and 3 cluster with RelA/SpoT proteins from intracellular pathogens (underlined).
