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Figure 2


Fig. 2. The cuticle structure of wild-type and DAAM mutant Drosophila tracheal tubes. Schematic drawing of a wild-type main airway (A) shows that tracheal cuticle is laid down on the inner apical surface of tracheal cells. The cuticle is characterized by taenidial folds, running perpendicular to the tube axis, that are clearly visible on a native tracheal tube dissected out from a third instar larvae (B). The tracheal tubes of a DAAMEx68 homozygous mutant larvae exhibit a strongly impaired cuticle pattern in both the main airways (C) and the side branches (D), often leading to the collapse of the tubes. (E) The trachea phenotype of DAAMEx68 over Df(1)AD11 (a deficiency that uncovers DAAM) is as strong as that of the homozygous DAAMEx68 phenotype (compare E with C). (F) btl-Gal4-driven overexpression of the full-length DAAM protein (FL-DAAM13.59) partly rescues the tracheal cuticle defects induced by DAAMEx68. Scale bars: 50 µm.





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