Fig. 1. Mad1 and Med7 are dominant-negative
alleles. (A) dpps6/dpphr4 wing with normal
veins. Longitudinal veins 1-5, the anterior crossvein (acv) and the posterior
crossvein (pcv) are shown. (B) dpps6/dpphr4
Df(2L)C28 with truncated L4/L5. (C)
dpps6/dpphr4 Mad1 with abnormal
L2/L3/L4, no crossveins and two margin notches. (D)
dpps6/dpphr4 Med7 with a truncated
L5 and two margin notches.