In order to avoid the confounding T cell memory response of the initial host, differences in the frequencies of virus-specific T cells and the existence of LCMV-specific antibodies, we sorted WT and Selplg-/- P14+ T cells from WT mice at 30dpi after they had that received both populations in a 1:1 ratio at the time of infection. The gene discussed is SELPLG; the disease is infection.