We measured serum cytokines in recipients of WT, Ceacam1-Tg and Ceacam1 2/2 T cells on days 7 and 14 post-transplant, and observed that levels of IFNc, TNF, IL-2, IL-4, IL-6, IL-10, and IL-12p70 were similar (data not shown). Percentages of FoxP3 + donor regulatory T cells and expression of T-bet were also similar between recipients of WT, Ceacam1-Tg and Ceacam1 2/2 T cells (data not shown and Table 1 ), and stimulation of splenocytes harvested on day 14 after BMT post-transplant from these three groups revealed essentially no IL-17 + donor T cells (not shown), and similar percentages of donor IFNc + T cells (data not shown and Table 1 ).