Figure 2.

Cytological characterization of slgM⁺IgD⁺CD38⁻ naive, slgD⁻CD38⁺ GC, and slgM⁺IgD⁺CD38⁺ B cells. (A) Giemsa staining of freshly isolated three B cell subsets (×1,000). (B) Expression of proliferation associated nuclear antigen Ki67 on freshly isolated B cell subsets (×1,000). (C) Giemsa staining of three B cell subsets after a 16 h culture, showing apoptotic figures in slgM⁺IgD⁺CD38⁺ GC founder cells and in slgD⁻CD38⁺ GC B cells. The quantitation of apoptotic cells is shown in Table 2.