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.