ART4 and infection: Frequencies of total CD8+ T cells (Figure 2A) and CD8+ T cells specific for the dominant LCMV glycoprotein epitope GP33 and nucleoprotein epitope NP396 were markedly reduced in the ear-dLNs of MasTRECK mice compared to that of WT animals at day 5 post infection (Figures 2B, C).