Imprecise excision of the progenitor insertion, resulting in an approximately 0.5kb deletion which includes the first exon of Efr.
visible
visible (with Efr1)
posterior crossvein (with Efr1)
wing vein L5
wing vein L5 (with Efr1)
Homozygous and hemizygous adults have a gap in the fifth longitudinal wing vein.
Efr1/Efr3 adults show a gap in the fifth longitudinal wing vein and in the posterior crossvein.
Efr3 is rescued by Efr+tIa
The gap in the fifth longitudinal wing vein that is seen in Efr3 homozygotes is completely rescued by Efr+tIa.