a, Comparison between localization of dCas13-GFP and dCas13a-GFP-KRAB constructs for imaging ACTB. Scale bars, 10μm b, Additional fields of view of the dCas13a-NLS-msfGFP negative-feedback construct delivered with a non-targeting guide. Scale bars, 10μm. c, Additional fields of view of the dCas13a-NLS-msfGFP negative-feedback construct delivered with ACTB guide 3. Scale bars, 10μm. d, Additional fields of view of the dCas13a-NLS-msfGFP negative-feedback construct delivered with ACTB guide 4. Scale bars, 10μm.