Cytoplasmic REL staining in the RC-K8 human DLBCL cell line. RC-K8 cells¹⁰  were analyzed by indirect immunofluorescence using an anti-REL antiserum against the C-terminal 15 amino acids of REL, as described by Houldsworth et al.⁴  In the right panel, nuclear DNA was detected in the same field using DAPI (4′,6 diamidino-2-phenylindole). Original magnification, × 600.