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TREC levels were assessed within SIVE660-infected macaques at 25 weeks (dotted columns) and 48 weeks (shaded columns) postinfection. The level of CD4+ T cells in blood (A) and the SIV viral load per milliliter of blood plasma (B) are shown for each macaque. TREC levels were determined by quantitative competitive PCR (38, 44) and are presented for the CD4+ (C) and CD8+ (D) T cells.
