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The three major signaling pathways and their interactions in the wing disc. Ptc: patched, Smo: smoothened, CiA(R): cubitus interruptus activator (repressor), Ubx: ultrabithorax, Col: collier, Dfz: Drosophila frizzled, Dsh: disheveled, Nkd: naked, Gro: groucho, Pan: pangolin, Yki: Yorkie, Ban: bantam
