Abstract
In 1980, Belyaeva et al. found in Drosophila melanogaster the ecs (ecdysterone sensitivity) locus, later designated BR-C (Broad-Complex). This locus plays a key role in the reaction cascade of ecdysterone-regulated development. The gene BR-C was cloned by Chao and Guild (1986) and Belyaeva et al. (1987). To conduct "walking along the chromosome" in Drosophila virilis, cloned sequences of the BR-C gene from D. melanogaster were used as probes, hybridizing the start sites. A fragment of about 100 kb containing BR-C of D. virilis was cloned. A restriction map of the cloned region was created.
