CDC assay protocol was adapted from previous studies49,50. Cancer cell lines were treated with 0.4 mg ml−1 antibodies with or without murine serum complement (Rockland) for 2 h at 37 °C. Lyophilized complement sera from mouse was reconstituted in PBS and serially diluted 1:10 to 1:1,000. Heat inactivation was performed by 30-min incubation at 56 °C. Cell death was determined as LDH release.
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