(A) Representative histograms of PD-1 labeling show unlabeled control (gray line), Rat Ig/PBS treated animals (dashed black line) and anti-CD40 and IL-2 treated animals (solid black line)
(A) Representative histograms of PD-1 labeling show unlabeled control (gray line), Rat Ig/PBS treated animals (dashed black line) and anti-CD40 and IL-2 treated animals (solid black line). B7-H1 to correlate with the observed loss of CD4+ T cells. These findings caused us to look more …