Analysis of CR2 expression by using MAb HB5 on wild-type and CR2-transfected astrocyte lines: T98WT (A), T98CR2 (B), CB193WT (C), CB193CR2 (D), and Raji (positive control) (E). The cells were stained with anti-CR2 MAb HB5 (open area) or with an isotype control (shaded area) and FITC-labeled goat F(ab′)2 anti-mouse IgG, as described in Materials and Methods.