PD-L1 augments Ag-specific CD8 T cell proliferation.

<p>A, and B, Brdu incorporation of OVA tetramer+CD8+ T cells. Mice were administered BrdU 16 hrs before sacrificing on day 5 after i.v. LM infection with or without PD-L1 blockade. C. Annexin V staining of tetramer+ cells. Data were analyzed by Student's <i>t</i> test, (**p<0.01). Data are representative of three independent experiments with five mice per group.