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Wang et al. (202 show that binding of the second messenger ppGpp to inosine-guanosine kinase (Gsk) in E. coli modulates the levels of the key metabolite phosphoribosyl pyrophosphate (pRpp), decreasing purine synthesis to favor amino acid synthesis during stress adaptation.Spatial orientation requires the execution of lateralized movements and a change in the animal's heading in response to multiple sensory modalities. While much research has focused on the circuits for sensory integration, chiefly to the midbrain superior colliculus