HRS cells and the transition from GC B cells to plasma cells. Heat map of the expression pattern in individual plasma cell (n = 5), GC B cell (n = 10), and HRS cell (n = 16) samples of the 262 (top) and 363 (bottom) probe sets robustly up-regulated (≥ 5 fold change, FDR q-value ≤ .027) by GC B cells over plasma cells and vice-versa, respectively.