TNF and infection: When stimulated ex vivo with 1μM cognate TagV antigen, TCR-V cells primed by MuPyV.TagV(QN) infection yielded memory cells that were capable of co-producing IFNγ and TNFα to a significantly higher level than those recruited by MuPyV.TagV or MuPyV.TagV(AN) infection (Fig 4B, left panel).