Fig. 6. Summary model comparing features of antennal (first line) and maxillary (second line) programs, and indicating their changes in the maxillary-to-antennal transformation (third line). Larval L2, early L3 (eL3), late L3 (lL3) and pupal stages are indicated at the top. Stages permissive to Dan expression in maxillary territory are in green; refractory are in yellow. The stippled background indicates Dfd expression associated with maxillary development.