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Transcriptional activity of different enhancer-promoter (e-p) pairs interacting in cis or in trans in the presence of GIs. Each genotype is examined for GFP expression in the third instar wing disk, eye disk and CNS. (A–E) Samples from hemizygotes of a transgene containing a given e-p pair linked in cis show higher levels of GFP expression than samples from heterozygotes containing same e and p, in a trans configuration (F–J). All transgenes are inserted in attP40.
