Inhibitory monoclonal antibody to human and mouse PAI-1 binds to an epitope localized to the F-Helix of PAI-1. The PAI-1/mab complex becomes a substrate rather than an inhibitor of its target proteinases tPA and urokinase. Currently being studied as a potential therapeutic agent in animal models. Purified by immobilized Protein A. IgG1 class.