Cell assays with anti-CD20/anti-CD59 bispecific antibodies: (a) Complement-dependent cytotoxicity assay in rituximab (RX)-(left) and HuMax-20 (HX)-(right) format on Raji cells and RX-based mAb2 on ARH-77 cells (center). Sample size was n = 3 for Raji and n = 2 for ARH-77 cells. One-way ANOVA was used to determine the significance (* 0.01 ≤ p < 0.05, ** 0.001 ≤ p < 0.01, *** 0.0001 ≤ p < 0.001, **** p ≤ 0.0001); (b) SK-BR-3 cell staining of RX-BER mAb2 molecules (left panel), the interaction of RX-BER2 and RX with SK-BR-3 cells with and without phospholipase C (PLC)-treatment (central panel), MEM-43-staining of SK-BR-3 cells with and without PLC treatment (right panel). 2nd only: cells stained with fluorescent conjugate only, without primary antibody. Presented are mean and S.D.