To measure the activity of a test substance in accordance with the method of the present invention, {HEAD ~ an activation reaction} of {TAIL ~ a blood coagulation factor} XII is initiated 
of
To measure the activity of a test substance in accordance with the method of the present invention , { HEAD ~ an activation reaction } of { TAIL ~ a blood coagulation factor } XII is initiated
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH