Fig. 1. Wing phenotypes of ash2 alleles. (A) Wild-type (wt) adult wing. Intervein regions (A-E, in blue), longitudinal veins (L1-L6) and anterior (a-cv) and posterior (p-cv) crossveins are marked. (B) Adult wing of ash2¹¹²⁴¹¹ homozygous mutant at the same magnification as A, showing anomalous L2 in which the distal half is crooked, ectopic crossvein tissue between L2-L3 and L4-L5, and a notch in the posterior margin. (C) Wing disc of wild-type third instar. (D) Wing disc of homozygous ash2¹¹²⁴¹¹ third instar. (E) Wing disc of homozygous ash2^I1 third instar. (F,G) Mitotic clones homozygous for ash2^I1 in Minute background. (F) Ventral clone where L2 appears thickened and intervein region A is reduced. (G) Dorsal clone showing ectopic vein tissue between the proximal region of L4-L5.