A fragment from upstream of the slp1 promoter (coordinates 2L:3817298..3817517 , release 6 genome), in which two of the four predicted Su(H) binding sites (sites 1 and 4) have been mutated (GGTGAGCGATAGTTTTCACAT to GGTGAGCGActaggagacgAT and CTGATATTTTTCACGGCTCAG to CTGActcgcTTtACGGCTCAG), is fused upstream of a basal Hsp70 promoter that is fused upstream of EGFP.