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Interaction of B7 with CD28 and CTLA4 plays an important function in T-cell activation and homeostasis. Disruption of CD28, CTLA4, or both has shown impact on T-cell biology. This paper examined the consequences of overexpressing a tailless mutant form of CTLA4 on T-cell activation and in vivo expansion.Retroviral gene transfer was used to infect bone marrow progenitor cells with either a control...
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