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(A) Baseline CD19/CD20 expression levels per B lymphoblas, and (B) frequency of CD19/20‐positive cells among peripheral B lymphoblasts. The median CD20 expression is 4885 molecules per cell, and the median CD19 level is 17,878 molecules (not plotted). The black triangle shows 25,763 CD20 molecules and 18,257 CD19 molecules (n = 13 patients) on the B lymphoblast surface.
