Fibrinogen (Sigma-Aldrich), soluble fibrin (Sekisui Medical), and FDP (Sekisui Medical), were also immobilized on 96-well plates (1 μg/well of each compound). The plate was reacted with antibody solution (1 μg/mL) for 1 hour, washed with TBS-T, reacted with horseradish peroxidase (HRP)-conjugated anti-human IgG-Fc antibody or anti-mouse IgG-Fc antibody (Bethyl) for 1 hour, and washed with TBS-T. After incubation with the TMB (3,3′,5,5′-tetramethylbenzidine) color-developing reagent for 15 minutes, the reaction was stopped by addition of 2 N H
2SO
4, and absorbance at 450 nm was measured. The antibodies used in this experiment were 1101, the negative control, and the previously established 59D8 mAb, which recognizes the N-terminus of Fibrinogen after thrombin cleavage.