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Vectors for gene targeting in Drosophila. Schematic maps of pP{Target} and pP{TargetB} are shown. Both vectors carry a mini-white marker gene (shaded arrow), FRTs (stippled triangles), an I-CreI endonuclease recognition sequence (X), and P-element ends for transposition (solid arrows). The two vectors differ in size and in restriction sites available for cloning.
