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Table I.

Cell surface markers used to identify different B cell subsets

Cell Population	Surface Markers	References
CD27⁻ subsets
Mature naive	CD23⁺CD38^−/+IgM⁺IgD⁺	15 16 17
T1 transitional	CD38⁺⁺CD24^high	18 20
T2 transitional	CD38^+/++CD24^int/high	18 20
Early class-switched memory	CD23⁻CD38^−/+IgM⁻IgD⁻	19
CD27⁺ subsets
Somatically mutated memory	CD23^−/lowCD38^−/+	13 14
Pre-GC	CD23^−/lowCD38⁺⁺	11

Cell Population	Surface Markers	References
CD27⁻ subsets
Mature naive	CD23⁺CD38^−/+IgM⁺IgD⁺	15 16 17
T1 transitional	CD38⁺⁺CD24^high	18 20
T2 transitional	CD38^+/++CD24^int/high	18 20
Early class-switched memory	CD23⁻CD38^−/+IgM⁻IgD⁻	19
CD27⁺ subsets
Somatically mutated memory	CD23^−/lowCD38^−/+	13 14
Pre-GC	CD23^−/lowCD38⁺⁺	11