cno mutants have defects in morphogenesis. (A) Domain structures and cno mutant. (B and C) Stage 7 wild-type (WT) or cno^R2 MZ embryos stained for Cno and antiphosphotyrosine (PTyr; insets) to show cell borders imaged on same slide. (D–J) Cuticles, anterior up. Genotypes are indicated. (E and F) cno^R2 zygotic mutants are shown. Arrows, head involution defects; arrowhead, dorsal closure defects. (G) cno^R2 MZ is shown. Only dorsal cuticle remains. (H) arm^XP33 MZ mutant (in eggshell) is shown, cuticle fragmented. (I) shg^R69 zygotic mutant retains only dorsal cuticle. (J) Rap1 MZ mutant retains only dorsal cuticle (see Results for Rap1 data). FHA, forkhead-associated domain; DIL, dilute domain. Bars: (B and C) 10 µm; (D–J) 100 µm.