The ubiquitous snRNA:U6:96Ac promoter drives expression of a single sgRNA (TCCTCTTGCACCCGTGGCGC) that targets EcR.
Crispr-Cas9 mutagenesis of EcR by expressing Spyo\Cas9UAS.Tag:NLS(Unk), either under the control of Scer\GAL4GMR71G10 or in the absence of a driver, and using EcRgRNA.pCFD3-1 as a guide, results in lethality.