Inhibition of HBcAg expression with CRISPR/Cas9. (a) The results from an HBV infection on NTCP/cas9 cells expressing sg5 and sg7 guide RNAs. d, doxycycline. Immunofluorescence was performed with HBcAg-specific antibody C1-5 8 days after HBV infection. (b) Results from a quantitative analysis of HBcAg-positive cells from three different experiments performed with sgRNAs 5, 6, and 7, as described in a. Co, control; UI, uninfected. *P < 0.05; **P < 0.01; ***P < 0.001.