A vas cDNA tagged with GFP is expressed under the control of the vas promoter.
wild-type
vasGFP rescues Df(2L)TE35D-18/Df(2L)A267
vasGFP rescues vasPH165
Expression of vasT:Avic\GFP in soloZ2-0198/Df(2L)A267 females substantially improves the number of germ cell cysts and nearly doubles fertility (number of progeny/female).