REL and diffuse large B-cell lymphoma: To establish whether the heterogeneity observed in RelA (but not RelB or cRel) between RIVA and U2932 cell lines was a property of ABC-DLBCL cell lines, all DLBCL cells or all B cells, we performed further NF-κB fingerprinting on another ABC-DLBCL cell line (HBL-1), a primary DLBCL patient lymph node biopsy, and healthy primary B cells extracted from peripheral blood (Figure 4).