Abstract
Plasma globulins derived from patients with greatly increased heparin resistance (shortened plasma heparin thrombin time), shortened the heparin thrombin time when added to normal plasma. The effective element appeared in the fraction containing fibrinogen. The reduction in the anticoagulant activity of heparin is caused by globulins not identical with coagulation factors possessing a known anti-heparin effect, a contributing role being played by fibrinogen.

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