A set of transgenic constructs that each consist of two single guide RNAs (sgRNAs) targeting about 500bp upstream of the transcription start site of the targeted gene. The two sgRNAs are under the control of two independent U6 (ubiquitous) promoters. When crossed to a stock that contains a source of nuclease-dead Cas9 fused to a transcriptional activation domain, such as dCas9-VPR, the targeted gene will be overexpressed wherever the dCas9-activator is expressed.
pCFD4 vector described at [CRISPR fly design](http://www.crisprflydesign.org/plasmids/)
Many of the TRiP RNAi and sgRNA stocks generated at Harvard Medical School (HMS lines) and Tsinghua University (HMC lines), but not stocks generated at the National Institute of Genetics in Japan (HMJ lines), contain the sev21 allele as a result of introducing a mutated X chromosome from Bloomington stock 35781 (FBst0035781) or 32261 (FBst0032261) as the transgenes were being established in stock.