More particularly, it relates to {TAIL ~ a method} of measuring the activity of a substance which inhibits or promotes {HEAD ~ the production} of the blood coagulation factor XII 
More particularly , it relates to { TAIL ~ a method } of measuring the activity of a substance which inhibits or promotes { HEAD ~ the production } of the blood coagulation factor XII
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH