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Figure 1


Fig. 1. Hox genes repress head and promote trunk. Cuticles of (A) wild type, (B) HoxCP, (C) tsh- HoxCP, (D) tsh- Hox- Scr+, (E) tsh- Hox- Antp+, (F) tsh- Hox- Ubx+, (G) tsh- Hox- abdA+ and (H) tsh- Hox- AbdB+, larvae. White arrows, denticles; black arrows, naked cuticle; arrowheads, crinkled head cuticle. Head cuticle is mostly in the posterior part of each trunk segment in B, but occasionally also differentiates in the anterior (left and right arrowheads). Inset in A shows the pigmented crinkled cuticle typical of the head skeleton. Inset in C highlights the crinkled cuticle. In D, the distance from the anterior border of the crinkled cuticle to the anterior trunk (line) is larger than that in C. The inset in E shows the small thoracic denticles (white arrow) invisible in the larger photograph. Head-like cuticle develops in A5-8 (arrowheads). Anterior is on the left for all panels.





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