Fig. 5.
Wnt co-receptor Arrow processes Wnt signals in axial growth, segmentation and leg formation. (A,B) Weak Tc-arrowRNAi phenotype. Few abdominal segments missing, leg defects in B. Arrowheads in B indicate tracheal openings. (C-E) Intermediate Tc-arrowRNAi phenotype. Few segments are developed, legs show abnormalities. (F-H) Strong Tc-arrowRNAi phenotype.. Cuticle spheres without signs of segmentation, with incomplete anterior head structures (white asterisks in F) and gut-like structure (fg) visible. A-C show a lateral view, D-F a ventral view. In A-E, schematics of the corresponding phenotypes are shown below. Red asterisks indicate affected cuticle structures. Open arrowheads in F,G indicate bristles. Ant, antennae; cx, coxa; fg, foregut; fl, flagella; Lr, labrum; pd, pedicellus; T1-T3, thoracic segments 1-3; to, tracheal opening; ug, urogomphi; vm, vitelline membrane; A1-A5 abdominal segments 1-5. Scale bar: 100 μm.