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Fig. 5. Expression of GBB does not induce ectopic anterior margin bristles on the wing blade. (A) Ventral view of a UAS.Gbb/ap.Gal4 wing with all bristles missing from the proximal anterior wing margin (arrowhead). A distal portion of the anterior wing margin, indicated by the black bar, is shown at higher magnification in B,C. (B) Dorsal view: the row of stout mechanosensory bristles appears in a roughly wild-type pattern with occasional gaps. The row of widely spaced chemosensory bristles shows considerable irregularity in spacing, with some bristles displaced dorsally. (C) Ventral view: the row of alternating chemosensory and thin mechanosensory bristles is disorganized and numerous thin mechanosensory bristles are present in a region ventral to their normal location.