A fragment from upstream of the slp1 promoter (coordinates 2L:3817298..3817517 , release 6 genome), in which the predicted scro binding site has been mutated (CACGTAATCAAGTGGAAATGA to CACGTAATCgtGTGGAAATGA), is fused upstream of a basal Hsp70 promoter that is fused upstream of EGFP.