UASt regulatory sequences are fused upstream of the EGFP version of Avic\GFP. A fragment containing 90 Zzzz\CGG repeats has been inserted between the transcriptional and translational start sites of Avic\GFP. The repeat fragment is derived from the 5'UTR of a Hsap\FMR1 gene containing premutation-length repeats, and consists of the sequence (CGG)[[9]]AGG(CGG)[[9]]AGG(CGG)[[70]].