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CHASE4 domain CHASE4. This is an extracellular sensory domain, which is present in various classes of transmembrane receptors that are parts of signal transduction pathways in prokaryotes. Specifically, CHASE4 domains are found in histidine kinases in Archaea and in predicted diguanylate cyclases/phosphodiesterases in Bacteria. Environmental factors that are recognized by CHASE4 domains are not known at this time.
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