LILRB1 ligation renders DCs resistant to CD95-mediated cell death. (A) Viable cells were counted at the end of culture under the indicated conditions by trypan blue exclusion. Results show means (± SD) of 6 experiments. (B) Annexin V and caspase-3 expression was analyzed by flow cytometry and histograms show percentage positive cells above control. Results are representative of 7 experiments. (C) Cell populations were cultured in the presence or absence of anti-CD95 mAb as indicated and analyzed for expression of annexin V. Results are representative of 2 experiments.