SIV-specific CD8+ T cells express high levels of PD1 and cytokines but have impaired proliferative capacity in acute and chronic SIVmac251 infection. by Petrovas, C, Price, D, Mattapallil, J, Ambrozak, DR, Geldmacher, C, Cecchinato, V, Vaccari, M, Tryniszewska, E, Gostick, E, Roederer, M, Douek, D, Morgan, S, Davis, S, Franchini, G, Koup, R