The amount of FXIIa produced relative to the amount produced in {TAIL ~ a control sample} which does not contain the tested substance or which contains {HEAD ~ a different test substance} may be used to indicate the relative activity of the tested substance 
The amount of FXIIa produced relative to the amount produced in { TAIL ~ a control sample } which does not contain the tested substance or which contains { HEAD ~ a different test substance } may be used to indicate the relative activity of the tested substance
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH