Binding of heat-aggregated IgG and IgM to Trx-ghA, Trx-ghB, and Trx-ghC. Various concentrations of Trx-ghA, Trx-ghB, or Trx-ghC were coated to the microtiter wells and a fixed concentration of either heat-aggregated human IgG (10 μg/well) (A) or heat-aggregated human IgM (20 μg/well) (B) was added and probed with HRP-conjugated anti-human IgG (A) or anti-human IgM (B), respectively. Color was developed using p-nitrophenyl phosphate, and A450 values were measured. All experiments were performed in duplicate, and Trx was used as a negative control.