594bp fragment corresponding to -1171 to -577 relative to the transcription start site of the eya-RB isoform is fused upstream of a minimal Hsp70 promoter followed by a cDNA encoding the eya-RB isoform (plus 3'UTR).
Expression of eyaRB.enh1+E partially rescues the no-eye phenotype observed either eya2 or eya1 homozygote adults, the rescue effect is stronger in the eya2 mutants.