Fig. 1. Genomic organisation of the dfer locus. (A) In GAL4^MZ465, pGawB (red) is inserted upstream of dfer (green). The deletions dfer¹ and dfer^ex1 are depicted (purple). (B) Exon structure of the four predicted dfer isoforms (a section of the third intron is deleted for clarity). Exon 1 is non-coding. Additional exons in dferRA and dferRD are in pink. (C) Predicted protein structure of DFer isoforms. (D) Molecular map of the dfer^gof locus. pGawB (red) has undergone a rearrangement, duplicating and inverting GAL4, and deleting pBluescript (pBS) and most of mini-white (mw⁺). (E) dfer^gof produces three transcripts, splicing the first exon of mini white (red) to exons of dfer (green). Light green exons are spliced out. (F) One transcript (wex1-DFerRB) is predicted to encode a White-DFer fusion protein.