UASt regulatory sequences drive expression of a truncated form of by which lacks amino acids 567-720.
byΔPTB.UAS/Scer\GAL4Bx-MS1096 rescues by2
Expression of byΔPTB.Scer\UAS under the control of Scer\GAL4Bx-MS1096 rescues the wing blister phenotype of by2 homozygotes.