{HEAD ~ Initiation} may be achieved by adding {TAIL ~ a blood coagulation factor} XII activator to animal plasma in the presence of the test substance 
achieved by adding
{ HEAD ~ Initiation } may be achieved by adding { TAIL ~ a blood coagulation factor } XII activator to animal plasma in the presence of the test substance
HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH