In addition, IFN‐λ1 mRNA (Figure 3G), ISG15 (Figure 3H), and ISG56 (Figure 3H) were induced at 9 days after HBV infection, but not mock or ultraviolet‐inactivated HBV (UV‐HBV) infection, in NKNT‐3/NTCP #28.3.25.13 cells. Here, ISG15 is linked to infection.