Cytotoxic thymus-derived lymphocytes generated after interaction with trinitrophenyl (TNP)-substituted or virus-infected cells only lyse H-2 compatible target cells modified with the component used to immunize (TNP or virus). Prior saturation of TNP-reactive sites inhibits neither the infectivity of influenza A viruses, nor the capacity of infected cells to develop antigenic changes recognized by influenza-immune T cells. The two antigens are distinct entities on the cell membrane and do not obviously compete to form interactions with H-2 molecules.

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