The constitutive ' U6:2 ' (snRNA:U6:96Ab) promoter drives expression a single Tag:MS2-tagged sgRNA that forms one component of the three-component flySAM (synergistic activation mediator) system, which is used to produce effective transcriptional activation of a gene of interest. In this case, the sgRNA sequence (TCTCTCACAGAGATTGGGAG) targets sequence upstream of Pvf2.