SDS-PAGE analysis of the proteins bound to suPAR-Sepharose. Lane 1, molecular weight markers; lane 2, suPAR-Sepharose incubated with PBS; lane 3, suPAR-Sepharose incubated with plasma; lane 4, suPAR-Sepharose incubated with scuPA and plasma; lane 5, suPAR-Sepharose incubated with scuPA and PBS.