Fig. 4. Dac does not antagonize either Dll or hth expression in the antenna. Both Dll (green in A,A') and Hth (green in B,B') expression are normal in dac-null clones (arrows) in the antenna. Dac is in red. (C,D) Increasing the duration, level and area of dac expression in the antenna using a dpp-GAL4 driver induces the formation of medial leg structures in the antenna. (D) A higher magnification image of the portion of the antenna boxed in C. Two bracted bristles characteristic of the medial and distal leg are indicated with arrows in D.(E) High-magnification image of the second and part of the third segments of a wild-type antenna. None of the antennal bristles normally possess bracts. (F) High-magnification image of the distal portion of the femur of a wild-type leg. Note the bracts (arrows) present at the base of each bristle.