FIGURE 2:

Both Rap1 and dzy RNAi delay germband extension, but effects of Rap1 RNAi occur earlier and are more severe. (A–I) Cross-sections of representative WT (A–C), Rap1 RNAi (D–F), and dzy RNAi (G–I) embryos, revealing extension of posterior end of the gut (red arrows) vs. the full distance to the cephalic furrow (cyan arrows). (J–O) Fractional germband extension at the indicated stages. (J–L) Rap1 RNAi substantially reduces germband extension at all stages. (M–O) dzy RNAi does not delay early germband extension (stage 7, G) but does reduce germband extension at later stages (H, I).