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Fig. 7. Diffusion of Hh signal across segmental borders. (A-D) Ectopic Hh expression in the anal primordium in the cad-Gal4/UAS-hh combination duplicates genital structures both in females and males. (A,B) Wild-type structures of the female and male external terminalia. (C,D) Duplicated male genital disc UAS-hh/cad-Gal-4. (E,F) Duplicated male genital discs stained with anti-Wg (green) and anti-Cad (red). Ventral section (E) and dorsal section (F) of the same disc. vVp, ventral vaginal plate; dVp, dorsal vaginal plate; dAp, dorsal anal plate; vAp, ventral anal plate; T8, tergite eight; GA, genital arch; Ap, anal plate; Ad, apodeme; Lp, lateral plate; Cl, clasper; PA, penis apparatus; Hy, hypandrium; Vp', vaginal plates; Ad', Hy'; Vp'; PA' are the duplicated structures. MGP, male genital primordium.