Construct: Contains the y gene with the following modifications; promoter sequences from -63 to +130 (which includes the TATA box and Inr, but not the translation initiation codon) have been replaced with 193bp of sequence from the Hsp70 promote and the y wing and body enhancers have been deleted.
Body colour: flies carrying yhsp70-enh in a y- background show a range of wing and body pigmentation, from fully mutant to nearly wild type, depending on the transgenic line used.