Examples of FC analysis in an FNA sample of a reactive lymph node. a Gating on all lymphocytes shows the expansion of the B cell population of the germinal center (CD20^brightCD10^dim) depicted in blue; nongerminal center B cells (CD20⁺CD10^-) are depicted in green and T cells are in red. No clonally restricted B cells were identified either in CD10⁺ or in CD10^- B cells. b Bcl2 expression levels in the different lymphocyte populations. Nongerminal center B and T cells displayed the same Bcl2 amount; normal germinal center B cells showed much lower levels of Bcl2 expression than T cells and CD10^- B cells.