To determine whether alterations in the expression of NF-κB encoding genes in adherent MCL cells are accompanied by changes in epigenetic marks, mono- and co-cultured JeKo-1 and REC-1 cells were subjected to chromatin immunoprecipitation (ChIP) using an antibody against H3K27me3, a repressive mark, followed by qPCR analysis using primers specific for the human NF-κB gene promoters (Table S3). This evidence concerns the gene NFKB1 and mantle cell lymphoma.