For this, B6 naive CD5lo, Ly6C−, and Ly6C+ CD8+ T cells were co-transferred to B6 hosts (group 1, CD5lo + Ly6C−; group 2, CD5lo + Ly6C+; and group 3, Ly6C− + Ly6C+ at a 1:1 ratio), followed by lymphocytic choriomeningitis virus (LCMV) infection and analysis of donor expansion on day 7 post-infection (7 dpi) (Fig. 5a, top). Here, CD8A is linked to infection.