to set milk for cheese

The criterion for positivity was determined for each antigen of each species applying a mixture model to the PP data which assumed two inherent Gaussian distributions: a narrow distribution or seronegatives, and a broader distribution of seropositives.

So the catheter didn't have anything to do with keeping him from touching himself? I don't usually go in for euphemisms, but Fineg is a man who says behind, as in I have a picture where he bit me in the behind. The catheter, it turns out, was in the chimp's femoral artery (to monitor blood pressure), not his urethra.

a forcing-frame; a cucumber frame