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Overview of fly leg development. On the left shows the relationship between En, Hh, wg, and dpp and the definition of the telopodite (Hh, Wg, and Dpp-dependent domain) and the coxopodite (Hh, Wg, and Dpp-independent domain). On the right shows the relationship between the three primary PD gene expression domains established by Hth, Dac, and Dll.
