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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.