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An autosomally inherited (generally dominant) coagulation disorder characterized by qualitative abnormalities of the von Willebrand factor (VWF). The mutant VWF causes decreased platelet adhesion due to a selective deficiency of high molecular weight multimers. The decrease in large multimers can be due to a failure to synthesize the multimers (\'group 1\') or enhanced ADAMTS13-mediated proteolysis of the secreted high molecular weight protein (\'group 2\').
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