Insertion of Stalker at a large distance from the wing enhancer.
P element at 7B deleted (chromosome in situ hybridisation), Southern blots show deletion of 1.3kb approximately -124kb with respect to the start of transcription of ct. Stalker element detected at 7B chromosome in situ hybridisation.
Weak phenotype with incomplete penetrance and expressivity: only one or two small excisions of wing tips in 20% of flies.