The present invention provides a method of measuring the activity of a substance to test how it inhibits or promotes the production of the blood coagulation factor {HEAD ~ XII} in {TAIL ~ an active form}  
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The present invention provides a method of measuring the activity of a substance to test how it inhibits or promotes the production of the blood coagulation factor { HEAD ~ XII } in { TAIL ~ an active form }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH