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Although cryopreservation of peripheral blood mononuclear cells (PBMC) is a commonly used technique, the degree to which it affects subsequent functional studies has not been well defined. Here we demonstrate that long-term cryopreservation has detrimental effects on T cell IFN-γ responses in human immunodeficiency virus (HIV) infected individuals. Long-term cryopreservation caused marked decreases...
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