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Heparin fractions of different molecular weight and with high affinity for antithrombin were studied with respect to their ability to potentiate the inhibition of activated clotting factors by antithrombin. Inhibition of thrombin, Factor IXa and Factor XIa showed similarities in the dependence on the molecular weight of heparin and was found to decrease with decreasing molecular weight. Inactivation of Factor Xa, Factor XIIa and kallikrein was, however, less dependent on the size of the polysaccharide and, to a great extent, was potentiated even by low-molecular-weight heparin fractions that had virtually no effect on the inhibition of thrombin, Factor IXa and Factor XIa.

biochemical journal

The molecular-weight dependence of the rate-enhancing effect of heparin on the inhibition of thrombin, factor Xa, factor IXa, factor XIa, factor XIIa and kallikrein by antithrombin