Complement is activated by IgG hexamers assembled at the cell surface.
Diebolder CA, Beurskens FJ, de Jong RN, Koning RI, Strumane K, Lindorfer MA, Voorhorst M, Ugurlar D, Rosati S, Heck AJR, van de Winkel JGJ, Wilson IA, Koster AJ, Taylor RP, Ollmann Saphire E, Burton DR, Schuurman J, Gros P, Parren PWHI
Science 343 (2014) 1260-1263