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Fig. 4. Expression of SMAD4100T induces ectopic mechanosensory bristles on the wing blade. (A) UAS.SMAD4100T/MS1096.Gal4 wing with six ectopic mechanosensory bristles (open arrowheads). This image is a composite of three wings such that all positions for ectopic bristles are shown (the three bristles on medial L3 never appear together). (B) Dorsal L1 of wild type with two campaniform sensilla (arrowheads). (C) Dorsal L1 of UAS.SMAD4100T/MS1096.Gal4 with a stout mechanosensory bristle replacing Twin Sensillum One (open arrowhead; black arrowhead indicates Twin Sensillum Two). (D) Ventral L3 of wild type with a campaniform sensillum (arrowhead). (E) Ventral L3 of UAS.SMAD4100T/MS1096.Gal4 with a stout mechanosensory bristle replacing the sensillum (open arrowhead). (F) Dorsal L3 of wild type with three campaniform sensilla (arrowheads). (G) Dorsal L3 of UAS.SMAD4100T/MS1096.Gal4 with a thin mechanosensory bristle replacing the proximal sensillum (open arrowhead). (H) Dorsal L3 of UAS.SMAD4100T/MS1096.Gal4 with a thin mechanosensory bristle replacing the middle sensillum (open arrowhead). (I) Ectopic thin mechanosensory bristles are seen on a wing with small, unmarked clones of cells homozygous for zw3M11 (open arrowheads).





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