Imprecise excision of the progenitor P{GawB}CG3777NP3544 insertion. A 31bp remnant of the insertion remains. Mature miR-980 is not produced, but CG3777 mRNA expression is not significantly different from that of wild-type controls.
mir-980Ex1-1, mir-980Ex1-2 and mir-980Ex1-3 contain an identical lesion.