Fig. 5. Ectopic pairing of the Wink-A7 transgene promoted by GAL4–HP1. In situ hybridizations using the digoxygenin (DIG)-labelled plasmid pWH (Lu et al., 1996) as a probe. (A) Loop between 87C1 and 84D. (B) Loop between 87C1 and 89E (Bithorax Complex). (C) Loop between 87C1 and 86D. (D) Loop between 87C1, 84D and 94A. The sites associating with 87C were all previously described as intercalary heterochromatin (Zhimulev et al., 1982).