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Blood, 5 November 2009, Vol. 114, No. 19, pp. 3994-4001.
Prepublished online as a Blood First Edition Paper on August 17, 2009; DOI 10.1182/blood-2009-05-217968.
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REVIEW ARTICLE
The pleiotropic role of the fibrinogen ' chain in hemostasis
Shirley Uitte de Willige1,
Kristina F. Standeven1,
Helen Philippou1, and
Robert A. S. Ariëns1
1 Division of Cardiovascular & Diabetes Research, Section on Mechanisms of Thrombosis, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom
A fraction of fibrinogen contains a differently spliced chain called ', which presents itself mainly as heterodimer with the common A chain as A/ ' fibrinogen. The ' chain differs from the A chain in its C-terminus and has important functional implications for fibrinogen. The presence of the ' chain modulates thrombin and FXIII activity, influences clot architecture, and eliminates a platelet-binding site. Associations of A/ ' fibrinogen levels with arterial and venous thrombosis have been reported, indicating that the functional effects of A/ ' fibrinogen may contribute to the pathology of thrombosis. This review summarizes the key biologic aspects of this interesting variant of fibrinogen and discusses inconsistencies in current reports.

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