FIG. 4.

Binding of radiolabeled factor H or FHL-1 to intact cells of C. albicans. Specificity of binding was confirmed by using 10⁹ cells in direct binding assays. The cells were incubated with either ¹²⁵I-labeled factor H, indicated concentrations of unlabeled factor H, or unrelated labeled proteins: i.e., C3b or BSA. As a control, radiolabeled protein was incubated in the absence of cells.