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Tests for the ability of Su(Hw) insulators to interact at various distances and positions in the transgenic constructs. Designations are described in the legend for Fig. 1. Lengths for the lambda- and gypsy-derived spacers (λ and Sg in construct names) are indicated. su(Hw)− refers to the su(Hw)v/su(Hw)f mutations, and N is the number of transgenic lines in which flies acquired a new y phenotype in the background devoid of the Su(Hw) protein.
