Allelic retrieval: a scheme to facilitate the repeated isolation of a specific segment of the Bordetella pertussis chromosome.

Abstract excerpt

A plasmid vector was designed, constructed, and used for the repeated retrieval of the bvgA gene from a number of Bordetella pertussis strains that, due to mutations in this gene, exhibited interesting phenotypes regarding the regulation of virulence genes. The vector was used in a scheme called allelic retrieval that exploits two cross-overs between cloned plasmid and native chromosomal sequences flanking the...

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