T-cell proliferation assays.

(A) Mature DCs grown in either FBS or AP are equally efficient at inducing allogeneic T-cell proliferation. (B) FBS-DCs induce autologous T-cell proliferation due to recognition of FBS-derived peptides. Primary responses were stimulated from autologous T cells by FBS-DCs with KLH added (●) and in the FBS-DC autologous MLR without antigen (▴) suggesting that xenogeneic FBS peptides are presented to autologous T cells. In contrast, the AP-DCs stimulated a response only when the foreign KLH antigen was present (▪), versus without KLH (♦).