For Research Use Only. Not for Use in Diagnostic Procedures. This is an ON-DEMAND item which requires minimum order quantity and extended lead time. Please Contact Us for a quote. Two-site ELISA method for the measurement of tPA-PAI-1 complexes. Assay designed with a Murine monoclonal antibody specific for tPA for coating, and capturing tPA-PAI-1 complexes, and a Murine monoclonal antibody, specific for PAI-1 and labeled with a Horse Radish Peroxidase (HRP) marker. The assay only measures tPA-complexed with PAI-1.