Abstract
P-element transformation vector pCaSpeR3 was modified to obtain pFRT. The new vector contains two tandem FRT sites flanked by several unique restriction sites and separated by a polylinker harboring five convenient restriction sites, and allows easy cloning of DNA fragments between or close to the FRT sites. FLP-mediated excision of DNA sequences cloned between the FRT sites was demonstrated in vivo. The vector was proposed for molecular genetic studies of the position effect variegation, structural and molecular organization of Drosophila polytene chromosomes, etc.
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