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The gypsy insulators flanking the white gene are inserted either (A) in the opposite or (B) in the same orientation. (C) Insertion of the 4.6-kb DNA fragment between the eye enhancer and the white gene domain flanked by the gypsy insulators. (D) Insertion of the 4.6-kb DNA fragment between the gypsy insulator and the white promoter. Designations are as in Figures 1 and 4.
