Fig. 2. Hh from posterior compartment cells signals to anterior cells both infront and behind as shown by Ptc expression in male and females. (A-D) Ptc (green) and hh-lacZ (red) expression in male (A,B) and female (C,D) genital discs. The segmental primordia corresponding to each genital primordium are indicated on the right side of each panel. The broken line separates the different genital primordia in each disc. Expression of ptc induced by Hh at the segmental border (arrows) and parasegmental borders (arrowheads). (E) Expression of Cad (red) and Ptc (green) in the A10-11 segment. In the analia, Cad is expressed in a gradient (double arrows) in the most anterior part of the A10-11 segment. (F,G) This new band of ptc expression (F) overlaps with the lowest intensity level of the cad expression gradient (G) in the analia.

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