Maximal cell-mediated lysis of targets infected with lymphocytic choriomeningitis virus occurs only within a H-2 compatible system. Syngeneic immune spleen cells are at least 100 times as effective as are allogeneic lymphocytes. Reciprocal restriction of cytotoxic T-cell activity has been shown to operative between H-2k, H-2d, and H-2b. Experiments with cogenic mice have localized the effect to the H-2 gene complex. Furthermore, the observation that lymphocytes from H-2a mice cause high specific 51Cr release from either H-2d virus-infected cells, indicates that identity at either the K or the D end of the H-2 gene complex is sufficient for this lytic interaction.

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