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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 7.7.

Figure 7.7

EGFR signaling patterns the tarsal segments. After the initial PD domains are established, EGFR ligands are produced at the center of the disc and activate a series of secondary PD targets in the progenitors to the tarsal segments.