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Molecular cloning of complementary DNA: Preparation of a plasmid vector with low transformation background

Analytical Biochemistry, ISSN: 0003-2697, Vol: 129, Issue: 1, Page: 249-252
1983
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Article Description

A simple method that allows the rapid preparation of oligo dG-tailed plasmid vectors is presented. The procedure involves purification of the tailed molecules by hybridization to oligo dC-cellulose followed by a stepwise thermal elution. The resulting plasmid is virtually devoid of transformation activity in the absence of oligo dC-tailed DNA fragments. It allows construction of cDNA libraries with as low as 1% of colonies harboring wild-type plasmids.

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