Figure 5: Genetic analysis of the requirement of hh. Panels (A) and (B) are scanning electron micrographs of the effects of clonal loss of HH function generated in flies with the genotype y w; PhspFLP}/+; Pry+, neor, FRT}82B e hh9/Pry+, neor, FRT}82B Sb63b M(3)95A2 Py+, ry+}96E. The arrow in panel (A) points to a hh clone in the distal maxillary palp that was marked with Sb+ M+ bristles and that did not affect growth; the growth of the other three distal maxillary palps in panels (A) and (B) were affected to varying degrees and lacked bristles. Panel (C) is a hh9 genetic mosaic in a pb mutant background generated in the genotype y w; PhspFLP}/+; Pry+, neor, FRT}82B pb27 Scr2 e hh9/Pry+, neor, FRT}82B pb20 Sb63b M(3)95A2 Py+, ry+}96E. The arrows indicate reduced maxillary palpus and the arrowheads indicate the loss of the maxillary palpus in panels (B) and (C). In panel (C) the left vestigial maxillary palpus was missing and remaining vestigial palpus on the right was Sb M (hh9/+).