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The surface antigens (HBsAg) decorating the lipid envelope of HBV are produced in excess during the life cycle of the virus, and its presence in blood indicates current hepatitis B infection. The Human HLA-A*0201 HBV ( FLLTKILTI) complex protein is a complex of HLA-A*0201 of the MHC Class I, B2M, and FLLTKILTI peptide of the HBV.