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Bacteria are directly exposed to metals in environment. To maintain the intracellular metal homeostasis, Escherichia coli contain a number of gene regulation systems, each for response to a specific metal. A periplasmic protein Spy of E. coli was found to be induced upon short-exposure to copper ion in CpxAR-dependent manner. Transcription of the spy gene was also induced by long-exposure to zinc...
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