Fig. 3.

Binding of the complement regulatory proteins C4bp, factor H and properdin (P) to E-M-MBL via the lectin pathway and EA via the classical pathway, using indicator cells prepared with comparable amounts of C4 bound; regulatory protein binding is expressed as mean channel fluorescence (MCF). Much greater amounts of C4bp and factor H, but not properdin, were bound during lectin pathway activation. Standard errors of the mean are indicated by error bars.