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Fig. 4. Epistasis results from misexpression and mutants. Sca or Gp150 were targeted to wing regions anterior to the AP compartment boundary using the dppGal4 driver. In C and F, wings that are dissected from dead pharate adults and expanded artificially (Couso and Martinez Arias, 1994) have a rounded appearance because of the procedure rather than the genotype. (A) Wild-type wing. (B) The dppGal4/UAS sca wing has a nicked wing margin (Lee et al., 2000). (C) UAS gp150 /UAS gp150; dppGal4/+ is similar. (D) UAS gp150/+; dppGal4/UAS sca is more severe despite fewer doses of UAS gp150. (E) Normal wing from gp1503/gp1504; dppGal4/UAS sca fly. (F) Nicked wing from scaBP2/scaBP2; dppGal4/UAS gp150 fly.