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An RpoD complementary system was constructed to increase the plasmid stability in Escherichia coli (E. coli). The E. coli strain carrying the rpoD285 mutation on its chromosome could not grow at high temperature without a plasmid containing the wild-type rpoD gene, and the selection was medium-independent in this system. To further examine this vector system, lacZ was cloned as recombinant DNA for...
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