(A and B) Western blot analysis of the indicated proteins in lysates from 293T cells co-transfected with plasmids encoding BCAP-Flag, Flightless-1, LRRFIP2-HA, NLRP3, ASC, and pro-caspase-1-RFP as indicated and immunoprecipitated for Flag. Black arrowhead in (B) indicates LRRFIP2 band. (C) Flag-tagged BCAP deletion mutants used in (D). (D) Western blot analysis of 293T cells co-transfected with plasmids encoding BCAP-Flag deletion mutants and Flightless-1. Lysates were immunoprecipitated for Flag and immunoblotted with anti-Flag and anti-Flightless-1 antibodies. Data are representative of 3 independent experiments.