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N activation in the AP organizer depends on vn. N activation in a vn1/vnC221 mutant (A–D) late third instar wing disc. (E–H) Pupal disc. (I–L) Early pupal wing. Relative to wild type (Figure 4), expression of Su(H)lacZ (green) and N (red) is reduced at the AP organizer (white arrowheads), whose position is marked by Ci (magenta). DV boundary is indicated by yellow arrowheads.
