FIG. 2.

Affinity of ς3-specific MAb 4F2 IgG and Fabs for T3D virions. Biotinylated 4F2 IgG (0.5 μg per ml) was bound to T3D-coated plates. Unbiotinylated 4F2 IgG and Fabs at the concentrations shown were used to compete the binding of biotinylated 4F2 to T3D virions. The amount of biotinylated 4F2 bound in the presence of competitor is indicated by absorbance at 405 nm. Error bars represent standard error of the mean for three independent experiments. O.D., optical density.