Mutation of a conserved tryptophan residue to alanine in cysteine repeat domain 1 (CR1).
Expression of sogA1.supersog1.Scer\UAS under the control of Scer\GAL4Bx-MS1096 compression of the anterior/posterior axis in the wing, resulting in fusion of veins L2 and L3 and of L4 and L5, significant loss of wing veins and a modest reduction in overall wing size.
Scer\GAL4Bx-MS1096, sogA1.supersog1.UAS, tsgUAS.cYa has wing phenotype