Fig. 5. Regulation of Dan by ss and Cut. (A) Dll and Dan expression in a spineless^aristapedia mutant antenna. Note the partial loss of Dan expression. (B) Loss of Dan expression in a spineless^aristapedia mutant antenna correlates with ectopic Antp expression (red). (C) Regions of a wing and leg disc. Ectopic expression of ss in clones of Gal4-expressing cells (labeled by co-expression of GFP, shown in red) induced ectopic Dan expression (green). (D) Ectopic ss expression in the antenna under ptc^GAL4 control repressed Cut (purple) and caused ectopic expression of Dan (green). Arrow and arrowhead show reduced Cut expression where ss was expressed. (E) Dan expression in cut¹⁴⁵ mutant clones (marked by the absence of ß-gal, red). Boxed area: Dan and Dan + Dll expression shown at higher magnification at right. Arrow indicates mutant clone in which Dan was not ectopically expressed proximally.

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