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Fig. 1. Effect of the Drosophila tendrils mutation on lumen formation in
the terminal branches of the tracheal system. Terminal branches are formed by
long cytoplasmic projections of tracheal terminal cells that develop a single
membrane bound lumen within each projection (top left panel). In
tendrils mutant terminal cells (top right and bottom panels),
multiple convoluted lumina are seen within individual projections. Image
courtesy of Boaz Levi, Amin Ghabrial and Mark Krasnow (Stanford University
School of Medicine, Stanford, CA, USA).