Serum levels of LPS and TNF- after splenocyte transplant. Total body irradiated B6D2F1 mice received 1 × 10⁷ splenocytes from control B6 donors, G-CSF–mobilized donors, or control B6D2F1 donors (n = 5/group). Serum was collected on day 7 posttransplant, LPS levels were determined by LAL assay (A), and the TNF- level was determined by ELISA (B). UD, under limit of detection. *P < .001 v recipients of control B6 donors.