As Ceacam1 can regulate the cytolytic responses of lymphocytes [34, 35, 36, 37, 38] , we assessed the cytolytic function of WT vs. Ceacam1 2/2 alloactivated CD8 T cells from the spleens of allo-BMT recipients on day 14. Ceacam1 2/2 CD8 T cells and WT CD8 T cells demonstrated similar cytolysis against 51 Cr-radiolabeled allogeneic A20 B cell lymphoma cells and EL4 controls ( Table 1) . Lastly, we found no differences in DC numbers, activation state (CD80, CD86, MHC class II) from the infusion of Ceacam1 2/2 or Ceacam1-Tg T cells (Table 1) , or in Ceacam1 2/2 allo-BMT recipients.