Insertion into the 5' non-transcribed region of vn.
Insertion of a 1.2kb P-element in the presumed regulatory region.
viable
visible
anterior crossvein
wing vein L4
Mutant flies show partial loss of wing vein L4.
Homozygotes exhibit interruption of wing vein 4 (usually in the central portion) and the anterior crossvein is absent.
K. Tartoff.