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To determine whether varied quantitative HLA expression affects the susceptibility of target cells to CTLs, a panel of 15 EBV-transformed lymphoblastoid cell lines expressing a fivefold difference of surface HLA-A2.1 antigens were employed. The susceptibility of these cell lines to HLA-A2.1-restricted and influenza virus matrix peptide-specific CTLs was correlated with the amounts of HLA-A2.1 antigens...