Fig. 1. Ubx regulates dpp transcription. (A) Wing (w) and haltere (h) imaginal discs hybridized with a dpp probe. In this and subsequent discs, anterior is to the left. (B-D') wing (w; C,C') and haltere (h; D,D') imaginal discs of dpp-lacZ¹⁰⁶³⁸ larvae stained with an anti-ß-galactosidase antibody. Note the different dpp expression in both discs. (E,E') A Ubx mutant clone, marked by the absence of GFP (in green) showing expression of dpp-lacZ^BS3.0 (in red). Within the clone, the dpp band of expression widens and is more intense. (F-G') Haltere discs of dpplacZ¹⁰⁶³⁸/+; bx³/TM2 (F,F') and dpp-lacZ¹⁰⁶³⁸/+; pbx/TM2 (G,G') larvae. In the bx mutant haltere disc the A compartment increases its size and the dpp expression is like that of the anterior wing whereas in pbx mutant haltere discs the dpp expression is slightly wider but the P compartment increases its size significantly. C'-G' are magnifications of the insets shown in C-G. The magnifications of the wing and haltere discs were done at exactly the same values.