UASt regulatory sequences are cloned upstream of coding sequences corresponding to knk.
Scer\GAL4btl.PS/knkUAS.cDa rescues knk1
Scer\GAL4btl.PS/knkUAS.cDa rescues knkex59
Expression of knkScer\UAS.cDa under the control of Scer\GAL4btl.PS rescues the tracheal defects and restores viability of both knkex59 and knk1.