Fig. 5. D-Pax2 and SoxN are expressed in the Drosophila compound eye and in the eye imaginal disc. (A) Genomic map of the SoxN locus and structure of the construct used to trace SoxN expression. The intronless SoxN gene consists of a translated region (TR) flanked by extensive 5' and 3' untranslated regions (5' UTR and 3' UTR, respectively). Regulatory sequences important for SoxN expression in the adult compound eye (B) and in the eye imaginal disc (C) are present in the promoter and the 5' untranslated region of SoxN (from –2939 to +869. P_SoxN). D-Pax2 expression was monitored using its minimal eye-specific enhancer SME. This enhancer is active in the cone cells of the adult compound eye (E) and their precursors in the eye imaginal disc (F). Comparison of both expression patterns in the eye imaginal disc shows that they are coincident (D,G,H).