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293T‐NE‐3TFs cells are susceptible to HBV infection when co‐cultured with HepG2.2.15 cells. (A) Schematic diagram of the co‐culture 293T‐NE‐3NRs and HepG2.2.15. (B) Cell morphology was observed by microscopy, scale bar = 100 μm. (C) Cells were fixed in −20°C methanol at 10 d post co‐culture. Then, HBcAg was determined by immunofluorescence. CsA, cyclosporine A
