Fig. 1. Ubx cell-autonomously regulates several target genes in the wing. (A-C) Confocal photomicrographs of third instar wing discs that express various potential targets of Ubx regulation (green) and bear clones of cells ectopically expressing Ubx (purple). (A) The vgQ enhancer is cell autonomously repressed by Ubx in clones close to the DV boundary. (A'-A''') Close-up views of the area boxed in A showing (A') ß-galactosidase expression driven by the vgQ enhancer and expression of Ubx together, (A'') Ubx alone, and (A''') vgQ enhancer-driven reporter gene expression alone. (B) Ubx cell-autonomously represses Kn on the AP boundary. (B'-B''') High-magnification views of the area boxed in B showing the expression of (B') Ubx and Kn together, (B'') Ubx alone, and (B''') Kn alone. (C) Sal is cell-autonomously repressed by Ubx. (C'-C''') Close-up views of the area boxed in C showing the expression of (C') Ubx and Sal together, and (C'') Ubx and (C''') Sal alone. In each panel, ventral is to the top and anterior is to the left.