{TAIL ~ FXIIa} plays a very important role in the initiation stage in the intrinsic blood clotting system, {HEAD ~ fibrinolysis system} and plasma kallikrein kinin system 
{ TAIL ~ FXIIa } plays a very important role in the initiation stage in the intrinsic blood clotting system , { HEAD ~ fibrinolysis system } and plasma kallikrein kinin system
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH