Fig. 7. Wing hair polarity after ft and fj misexpression. (A-H) Hair polarity in adult wings. (A) UAS-ft/+; en-gal4/+. (B) Dorsal hairs in UAS-ft/+; ap-gal4/+. (C) UAS-ft/+; ptc-gal4/+. (D) sal-gal4/+; UAS-ft/+. (E) UAS-ft/+; ds⁰⁵¹⁴² en-gal4/ds⁰⁵¹⁴². (F) UAS-ft/+; fj^d1 en-gal4/fj^d1. (G) sal-gal4/+; UAS-fj/+. (H) fj^d1 sal-gal4/fj^d1; UAS-fj/+. (I-P) Examples of wing hair polarity. The regions shown are between distal L3 and L4 for I and K, posterior to the PCV for J, L, M and N, and between distal L4 and L5 for O and P. (I,J) en-gal4/+; UAS-ft/+. (K) UAS-ft/+; ptcgal4/+, (L) sal-gal4/+; UAS-ft/+. Hairs are often repolarized towards regions with higher ft expression (A,C,I,K, near the anteroposterior boundary), although exceptions are observed. Hairs near the PCV are repolarized within regions of uniform misexpression (A,B,J). (M) UAS-ft/+; ds⁰⁵¹⁴² en-gal4/ds⁰⁵¹⁴². Posterior polarity defects are decreased in the ds mutant background (compare with J), but are not eliminated; the polarity differs from that in the same region of the ds mutant (Fig. 4A). (N) UAS-ft/+; fj^d1 en-gal4/fj^d1. Posterior polarity defects are decreased by the loss of fj (compare with J). (O) sal-gal4/+; UAS-fj/+. (P) fj^d1 sal-gal4/fj^d1; UAS-fj/+. The hair polarity induced by fj misexpression was normal between L4 and L5 (O), but was altered in the fj^d1 background (P). Hairs point towards regions with higher fj expression (H,P).