Figure 2.

Serum IgM RF and κ/λ hybrid antibodies levels after treatment with DTT. (a) The effect of treatment with DTT on removing IgM RF. Four RF positive RA serum samples were incubated with DTT for 60 min; all or most of the IgM RF were eliminated. The concentrations of IgM RF (IU/mL) were measured by ELISA. (b) Levels of κ/λ hybrid antibodies of RA serum before and after being eliminated with IgM RF. Removing IgM RF completely showed little influence on the levels of serum κ/λ hybrid antibodies. Concentrations of κ/λ hybrid antibody are presented in arbitrary units (AU/mL).