Figure 3: The maxillary palpus phenotypes of three independent mosaic analyses. Panels (A) and (B) are scanning electron micrographs of the effects of clonal loss of PB function generated in flies with the genotype y w; PhspFLP}/+; Pry+, neor, FRT}82B pb27/Pry+, neor, FRT}82B Sb63b M(3)95A2 Py+, ry+}96E. In panel (A), a Sb+ pb27 clone in the distal maxillary palp is shown and the maxillary palp is reduced. In panel (B), Sb pb+ distal maxillary palps are shown; the right is wild type, and the left is reduced indicated by the arrow. In panels (A) and (B), the arrows indicate Sb bristles and the arrowheads Sb+ bristles. Panels (C) and (D) are bright field micrographs of clonal loss of PB function generated in the genotype y w; PhspFLP}/+; Pry+, neor, FRT}82B pb27 Scr2 Pw+, ry+}90E/Pry+, neor, FRT}82B M(3)95A2 Py+, ry+}96E Pexd+, w+}. Panel (C) is one of the 22 pb27/+ wild type distal maxillary palps with the y+ proximal palpus bristle indicated by the arrow and y+ maxillary socket tricombs indicated with the arrowhead. Panel (D) shows a y- pb27Scr2 maxillary palpus. Panels (E)–(G) are bright field micrographs of distal maxillary palps from the clonal ectopic expression of PB in a pb27/pb20 mutant background generated in the genotype y w, Pw+, pba>y+>Tubα1}B; PhspFLP}/+; pb27/pb20. Panel (E) is a rescued y- and PB expressing (pba>Tubα1) maxillary palpus, panel (F) is a reduced y- and PB expressing (pba>Tubα1) maxillary palpus, and panel (G) is a reduced y+ pb- (pba>y+>Tubα1) maxillary palpus.