Size-exclusion chromatography (SEC) and dynamic light scattering in tandem enable more accurate characterization of the complexes formed with 2F5 IgA. Virus incubated with 2F5 dIgA was separated over a size exclusion column and followed by particle detection by (A) infrared, (B) ultraviolet, and (C) DLS detection. Size was determined for each peak eluted from the SEC system and the % of signal intensity corresponding to complex size is shown. Three peaks were detected with dIgA preparations, eluted at (D) 19, (E) 21, and (F) 23 minutes, measuring 450 nm, 298 nm and 180 nm, respectively. Experiments were performed in triplicate. Results shown are from one representative experiment.