ninaE promoter sequences drive expression of amino acid residues 1-675 of trp (containing five transmembrane regions) fused with amino acid residues 681-1124 of trpl and tagged at the C-terminal with EGFP.
The presence of trp::trplninaE.trp1-675.trpl681-1124.T:Avic\GFP-EGFP in trpl302; trp9 double mutants results in a response to light that declines towards baseline during prolonged intense light.