What is the purpose of the study described in the article?
The purpose of the study described in the article is to investigate the vascular sequestration of heparin, the metabolism of heparin in humans and animals, the separation of active and inactive forms of heparin, the structure of heparin oligosaccharide fragments, and the anticoagulant activities of heparin oligosaccharides and their neutralization by platelet factor 4.