Fig. 3. Dan and Danr expression. (A) Eye-antenna disc showing Dan protein expression. (B) Dan (green) and Danr (red) expression in the antenna region of an eye-antenna disc. (C) Dan expression in the leg disc. A small group of cells in the location of sense organ precursors are labeled late in development. (D) Dan and Hth (red) expression in the antenna. (E) Dan and Dll (blue) expression in the antenna. (F) Dan and Cut (purple) in the antenna. An optical cross-section across the region indicated by the arrow is shown below. (G) Schematic representation of the expression domains of Hth, Dll, Cut, Dan/Danr and the inferred domain of spineless (SS) expression with reference to antenna segments.