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An inhibitor of urokinase present in increased concentrations in plasma during pregnancy was purified. The inhibitor was identified by its pronounced effect on urokinase-induced fibrinolysis as opposed to the absence of effect on fibrinolysis induced by a tissue plasminogen activator. The inhibitor progressively inactivated urokinase upon incubation and was found to be indistinguishable from alpha1-antitrypsin.
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Clemmensen et al. (2009) studied this question.