Inhibition of CS2-PE binding to immobilized CSA-BSA by LF. Spots of CSA-BSA immobilized on plastic slides were pretreated with indicated concentrations of LF. After removal of the LF solution, the slides were subjected to the cytoadherence assay. Each point represents the mean ± standard deviation (SD) of triplicate determinations. The average of the number of CS2 bound to immobilized CSA-BSA in the absence of LF was 298.8 PEs/mm².