A heterogeneous group of proteolytic enzymes that convert PLASMINOGEN to FIBRINOLYSIN. They are concentrated in the lysosomes of most cells and in the vascular endothelium, particularly in the vessels of the microcirculation.

Synonyms: Uterine-Tissue Plasminogen Activator, 0, Uterine Tissue Plasminogen Activator, Plasminogen Activators, EC 3.4.21.-, Plasminogen Activator, Extrinsic Plasminogen Activators