Fig. 7. The Abd-B r function is required for the development of the male genitalia. (A-D) In the male genitalia, some Abd-B^Uab1 clones transform into leg tissue (A, boxed region is amplified in B; arrows point to bracted bristles) or into antenna (C, boxed region is amplified in D), ar, malformed arista; III, third antennal segment. (E-G) Some Abd-B^Uab1 clones in the A9 of the male disc, marked by the absence of the lacZ marker (red, E) eliminate Abd-B expression (green, F). Merged image in G. (H-J) Male disc bearing similar clones, marked by the absence of GFP (green, H), eliminate Abd-B expression (I, blue), and in some cells activate Dll (I,J, red, arrow). In some clones there is no Abd-B expression but no Dll activation either (arrowheads, I). (K) Drawing of a male genital disc showing the distribution of Abd-B^Uab1 clones that eliminate Abd-B expression (pink) and those that do not (green). The region where most `pink' clones accumulate includes, mainly, the presumptive penis apparatus domain. (L) Internal genitalia of an Abd-B^Uab1/Abd-B^x23-1 female. Note the presence of three spermathecae (s) in the highly abnormal internal genitalia. vp, vaginal plates.