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A new method of constructing a set of bacterial cell clones varying in the strength of a promoter upstream of the gene of interest was developed with the use of Escherichia coli MG1655 and lacZ as a reporter. The gist of it lies in constructing a set of DNA fragments with tac-like promoters by means of PCR with the consensus promoter Ptac and primers ensuring randomization of the four central nucleotides...
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