Higher percentages of central memory lymphocytes in lymph nodes from animals treated with anti-FasL. Memory and naive lymphocytes were examined in lymph node biopsies collected at the time of peak virus replication (2 weeks after infection). Consistent with data for blood samples, the CM CD4 (A) and CD8 (B) lymphocyte percentages were significantly higher in the anti-FasL–treated group. *P < .05. Error bars indicate SEM.