Persistent Polyclonal B Cell Lymphocytosis B Cells Can Be Activated through CD40-CD154 Interaction

Figure 1

Phenotypes of B cells isolated from the blood samples of six patients with persistent polyclonal B cell lymphocytosis. Flow cytometry analysis of CD19, CD27, IgD, and IgM expression was done on purified peripheral B cells. More than 95% of purified cells were CD19⁺CD40+ cells for all these patient samples. All analyses were done as described in methods.