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The stringent response is a conserved stress–adaptation program in bacteria, mediated by the alarmones (p)ppGpp that reprogram transcription, translation, and metabolism. This mini–review surveys mechanistic, physiological, and evolutionary facets of alarmone singnaling across two classes of RelA/SpoT homologue (RSH) enzymes: multidomain-containing long RSHs and small alarmone synthetases/hydrolas
