Figure 1. NHL cells express CD20 on their cell surface.

(A,B,C) DoHH-2 cells (A), DoHH-2 cells resistant to beta-irradiation (DoHH-2^betaR) (B) or resistant to gamma-irradiation (DoHH-2^gammaR) (C) were stained with mouse anti-CD20-PE-IgG1 antibodies and analyzed by flow cytometry. Untreated cells (Control) are exhibited as thin solid curves, the isotype matched controls detecting unspecific binding of the antibodies as thick solid curves (Isotype mouse IgG1) and the mouse anti-CD20-PE-IgG1 antibodies stained cells as grey filled curves (CD20).