Imprecise excision of the progenitor insertion has resulted in a 1500bp deletion, removing the promoter and extending into the second exon of Ada2b.
Homozygotes and Ada2bd272/Df(3R)Ada2bd52 transheterozygotes show 77% lethality at the P5 pupal stage, and only 23% reach the pharate adult stage. No animals emerge as adults.