Model Description: These mice harbor a CAG-LSL-2xKRAB-dCas9-IRES-EGFP-WPRE-pA conditional expression cassette in mouse Rosa26 loci via homologous recombination. This strain can be used in CRISPR mediated target gene transcriptional inhibition (CRISPRi). The loxp-stop-loxp cassette was deleted.