PP sheet was purchased from TAP Plastics. Fibrinogen, KLH, recombinant uricase from Candida sp., and all chemicals were purchased from Sigma-Aldrich unless otherwise noted and were used as received. Methoxy-PEG– N-hydroxysuccinimide (mPEG-NHS) (10 kDa, 95%) was purchased from Nanocs Corporation. Goat anti-mouse IgM Ab and goat anti-mouse IgG Ab was purchased from Bethyl Laboratories. Pierce Protein Concentrators (100,000 molecular weight cutoff) were purchased from Thermo Fisher Scientific (Waltham, MA). A 3,3′,5,5′-tetramethylbenzidine substrate solution was purchased from eBioscience (San Diego, CA). High-resolution SEC resin (Sephacryl S-500HR) was purchased from GE Healthcare Life Sciences. The C5b-9 assay ELISA kit was purchased from BD Bioscience.