Table 1.

Cell surface marker expression examined on lymphocytes by four-color flow cytometry

Marker expressedCell type defined
FL-1FL-2FL-3FL-4
CD45RACD62LCD3CD4Naive or memory CD4+ T cells
CD45RACD62LCD3CD8Naive or memory CD8+ T cells
γδ TCRCD8CD3CD4γδ T cells
CD20CD2CD3CD4B cells, T cells
CD25CD69CD3CD4Activated T cells
CD38HLA-DRCD3CD8Activated MHC II+CD8+ T cells
CD38HLA-DRCD3CD4Activated MHC II+ CD4+ T cells
CD8CD28CD3CD4Costimulatory T cells
CD38CD56CD3CD8NK cells (CD3CD8+ CD56+)
CD4HLA-DRCD34CD8Pluripotential stem cells