Stable NIK expression occurs in all assayed HL cell lines. (A) Western blot analysis of NIK, TRAF2, and TRAF3 components of the NCP in HL cell lines KM-H2, L1236, U-H01, L428, and L540. (B) Western blot analysis of NIK protein levels in GCB-DLBCL lines HT and SUDH4, ABC-DLBCL lines Ly3, Ly10, and HBL-1, MM cell line L33, and PMBL cell lines MedB1 and K1106. (C) Western blot analysis of relB, NIK TRAF2, and TRAF3 levels on induction of relB shRNA in U-HO1 HL cell line, from 1 to 4 days after shRNA induction.