The difference in survival between the CTLA-4/B7-1 −/− and the CTLA-4 −/− (mean = 17.5 d; n = 11) strains did not reach statistical significance ( P > 0.05; Fig. 1 ).
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B7-1 or B7-2 is required to produce the lymphoproliferative phenotype in mice lacking cytotoxic T lymphocyte-associated antigen 4 (CTLA-4).
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