Increased serum TNFα and IL-1β levels after higher TBI doses. Mice were bled at the above-mentioned times post-BMT after conditioning with 900 cGy (□) or 1,300 cGy TBI (▪). Data represent the mean ± standard error. At day 7, the TNFα data represent n = 15 and 18 in the 900 and 1,300 cGy groups, respectively, with between 5 and 9 animals in each group at the remaining time intervals. For IL-1β, n = 13 and 20, respectively. * P < .01 and < .001 at days 6 and 7, respectively, for TNFα and P < .02 at day 7 for IL-1β.