Double immunofluorescence staining with anti-TNFR2 and anti-CD68 confirmed that nearly all TNFR2+ cells (tentatively 93–97%) co-expressed CD68 (Figures 5G–I); the percentage of CD68+ TNFR2+ cells in the CD68+ cell population was more variable, ranging from 25 to 75% (median value 39%) in different MS brain samples (n = 5). This evidence concerns the gene TNFRSF1B and myeloid sarcoma.