UASt regulatory sequences are fused upstream of the EGFP version of Avic\GFP. A fragment containing 90 Zzzz\CCG repeats has been inserted between the transcriptional and translational start sites of Avic\GFP. The fragment containing the 90 Zzzz\CCG repeats is the same fragment as that contained within the P{UAS-CGG90-EGFP} construct, but it is inserted in reverse orientation in the P{UAS-CCG90-EGFP} construct.