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Fig. 6. Sal restricts bab expression in the wing and haltere. (A) Wild-type expression of Bab (purple) and Sal (green) in the wing disc. (B,B',B'',B''') sal null clones (marked by the absence of green Myc staining) in the center of the wing pouch (arrowheads) lose Dll (blue) expression and activate Bab (red). (C) Wild-type expression of Sal (green) and Bab (purple) in the haltere. (D) A sal null clone in the haltere disc (arrowhead) also activates Bab.