Although the percentage of PNA+ cells, either CD4+ or CD8+, did not significantly change during T. gondii infection (Figures 1b, e), PNA expression did increase as infection progressed, and at 10 dpi a significant 2- and 1.5-fold increase was observed in CD4+ and CD8+ cells (Figures 1c, f), respectively. This evidence concerns the gene CD8A and infection.