The cascade starts when a protein called tissue factor is exposed to the bloodstream due to a cut or other injury. (scripps.edu)
More clinical research is needed to define safety procedures, as well as how many cells of which types and what other tissue factors produce the desired results. (scientificamerican.com)
One such protein, tissue factor pathway inhibitor (TFPI), impedes the initiation of coagulation. (scientificamerican.com)