Infiltration of CD8⁺ GrzB⁺ cells in the interfollicular spaces of FL lymph nodes. (A) Representative section from FL lymph nodes of cells positive for CD8 as detected by IHC (original magnification ×200). (B) Examples of low (top panel) and high GrzB (bottom panel) staining (Original magnification, 400). (C) Double staining for CD8⁺GrzB⁺ cells. White arrow indicates double-positive cells (Original magnification, ×1000).