Virus-specific T cell response. (A) Gag CM9 tetramer staining of blood lymphocytes over time in the Mamu-A*01⁺ animals of groups 1 and 2. (B) CD8⁺ and CD8^– T cells expressing CD107, TNF-α, and IFN-γ following stimulation with peptide pools encompassing the entire SIV Gag protein. The mean values and SD of the percentage of T cells positive for all markers are shown.