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CD19 Expression on normal and malignant B cells (a) Antigen density of CD19 was measured on the indicated human B cell lines by quantitative flow cytometry. Error bars indicate standard error mean (SEM) of 2–4 independent experiments. (b) Antigen density of CD19 was enumerated on normal human PBMCs and malignant B cells from 4 CLL and 2 DLBCL DTCs or PBMCs. Error bars represent SEM of independent samples. Unpaired Student’s t-test was used to determine significance
