Fig. 8. Diffusion of Wg and Dpp signals across segmental borders. (A) The terminalia of dpp^d5/dpp^d12 mutant males is very much reduced. Note the triplication of penis apparatus structures (asterisk) and the apodeme (arrowhead). (B) Ectopic dpp clones induced 24-48 hours after egg laying (indicated by a dotted line) non-autonomously recover the whole inventory of external genital structures, with the exception of one lateral lobe structure. (C) Phenotype of Sp/wg^cx3 females with reduced vaginal plates and no vulva. In this mutant background, overexpression of Wg in the Cad domain (D) duplicates the vaginal plates (arrow). (E) Phenotype of Sp/wg^cx3 males with no penis apparatus structures, and reduced claspers plus fused lateral plates (asterisk). Note the duplication of the lateral plate. In this mutant background, overexpression of Wg in the Cad domain (F) recovers the claspers (arrowhead) and some penis apparatus structures (arrow).