CD11c bead purified DCs from C57Bl/6 mouse bone marrow were left untreated, treated with a low (15 μM per 106 DCs) or high dose (100 μM per 106 DCs) of γ-secretase inhibitor L-685458, followed by infection with BCG. Washed and viable DCs were injected i.p. to naive mice. 2 weeks later, spleen T cells were analyzed for IFN-γ producing CD4 T cells using flow cytometry(a), and Ag85B specific T cells using ELISPOT (b) (p values, t test; 2 experiments).