On the cover: Immunofluorescent staining to detect C3d complement component deposition in mouse cardiac allografts during rejection initiated by memory CD4 T cells in recipients treated with costimulatory blockade and FTY720. Original magnification ×40. Zhang, Q., Y. Chen, R. L. Fairchild, P. S. Heeger, and A. Valujskikh. 2006. Lymphoid sequestration of alloreactive memory CD4 T cells promotes cardiac allograft survival. J. Immunol. 176: 770–777.