(A) Flow cytometry analysis was done for CD10, CD20 and CD81 expression in 2 individual diffuse large B cell lymphoma patient samples, DL-01 and DL-02. Shown is a dot plot of CD20 expression and CD3 expression gated on live cells, along with histograms for CD10, CD20 and CD81 expression gated on CD3-negative tumor cells. CD81 expression was high in all cases, regardless of CD10 expression. The data are representative of 8 individuals. (B) Flow cytometry of plasma cell myeloma involving the bone marrow shows increased expression of CD81 in plasma cells (CD20-negative).