Fig. 6. Msk prevents vein fate. (A-J) Adult wings, anterior upwards. (A-H) Broken lines in A-C and F-H indicate the AP boundary; magnifications are equal in all panels; genotypes/driven elements are indicated. Arrows indicate Twiggy wing phenotype in A. Asterisks indicate lost veins in B,C,H. There is enhancement of vein loss by Msk (arrows in G,H) and enhanced vein formation by msk loss-of-function mutation (compare at arrows in D and I, E and J).