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. Author manuscript; available in PMC: 2014 Feb 9.
Published in final edited form as: Curr Top Dev Biol. 2012;98:173–198. doi: 10.1016/B978-0-12-386499-4.00007-0

Figure 7.2.

Figure 7.2

Wg+Dpp initiate the PD axis. (A) Meinhardt’s “three-sector” model for induction of the PD axis. (B) Hh, from the P compartment, induces Wg (yellow) in the anterior ventral (AV) domain and Dpp (blue) in the anterior dorsal (AD) domain; note that Wg- and Dpp-expressing cells are only adjacent in the center of the wild-type disc. (C–E) An ectopic source of Dpp (C) in the ventral domain induces an ectopic PD axis visualized in the disc (D) and in the adult appendage (E; from Campbell et al., 1993).