Relative WASp expression levels in distinct B-cell subsets. B cells in different lymphoid compartments from a WT mouse were stained for WASp expression in addition to surface markers to determine B-cell subpopulations. Relative WASp expression and mean fluorescent intensity are shown for each of the B-cell subsets derived from (A) BM, (B) spleen, and (C) peritoneal cavity. Data shown are representative of more than 5 individual mice.