Monoclonal mouse anti-human C1s, or TNT003, was made as previously described (37). TNT003, nonspecific isotype control antibody (Control, IgG2a, #BE0085; BioXCell, West Lebanon, NH), anti-C5 (#A217; Quidel, San Diego CA), and a nonspecific isotype control antibody (Control, IgG1, #BE0083; BioXCell) were cleaved to produce F(ab′)2 fragments (F(ab′)2 Prep Kit, #44988; Thermo Scientific, Rockford, IL), thereby removing any nonspecific Fc-mediated effects of the inhibitor. Control F(ab′)2 antibodies were used in assays at the same concentration as the highest dose of TNT003. Single donor normal human serum (NHS) was used as source of active complement (#IPLA-CSERS; Innovative Research, Novi, MI).
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