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Fig. 1. Subdivision of the proximodistal (PD) axis in the wing disc. (A) Cartoon of a third instar wing imaginal disc, showing wing pouch (P), distal hinge (DH), proximal hinge (PH), lateral hinge (L) and notum (N). Anterior is up and dorsal is to the left in all figures. (B) Adult wild-type wing showing PD subdivisions. Labels are the same as in A, except for the wing blade (WB), which fate maps to the pouch. (C-E) Late third instar wing disc stained for Tsh (red) and Hth (blue). Neither is expressed in the pouch. Hth extends throughout the entire hinge, while Tsh is restricted to the PH. A deep fold in the epithelium (yellow arrowhead in C) marks the separation between DH and PH.





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