Abstract
We describe here the construction of a plasmid that combines positive selection with tetracycline resistance. The vector comprises a modified version of the gene encoding the cytosine-specific DNA methyltransferase MspI and a modified form of the pBR322 tetA(C) gene. The combination of these two genes facilitates the selection of recombinant plasmids in broth cultures, thereby eliminating the need for bacterial plating.
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