(in Diehl et al). Two-dimensional cluster analysis of 15 B-cell lines, 9 T-cell lines, and 5 classical Hodgkin’s lymphoma cell lines (3 of B-cell type and 2 of T-cell type) employing 46 genes highly characteristic for their expression in all types of B cells (except plasma B cells) and T cells, respectively. High gene expression is indicated in red, low or absent gene expression in blue.