TNFRSF9 and infection: Our results indicate that HLA-EUL40 and HLA-A2pp65 CD8 memory T cells share common phenotypic evolution post-infection with the coexpression of the regulatory receptors 2B4, Lag-3, Tim3 and 4-1BB as an early signature for the primary infection followed by the loss of Lag-3 and Tim3 and the gain of KLRG1 as a signature of T cell restimulation and long lived T cells during virus reactivation and chronic infection/latency, respectively.