Fibrinogen and factor XIII: newly recognized roles in venous thrombus formation and compositionWolberg, Alisa S.Current Opinion in Hematology: September 2018 - Volume 25 - Issue 5 - p 358–364 doi: 10.1097/MOH.0000000000000445 HEMOSTASIS AND THROMBOSIS: Edited by Alvin H. Schmaier Abstract Author Information Purpose of review In spite of significant morbidity and mortality associated with venous thromboembolism, the underlying pathogenesis remains poorly understood. Recent findings Clues to operant pathogenic mechanisms are found in the unique morphology and composition of these thrombi, which have substantial red blood cell and fibrin content. Recent studies have revealed biochemical and biophysical mechanisms that dictate fibrin structure in venous thrombi and promote retention of red blood cells within the contracted clots. These mechanisms include newly recognized contributions of fibrin network structure and factor XIII(a)-mediated fibrin crosslinking to venous thrombus composition, size, and stability. Summary Continued work to elucidate mechanisms by which fibrin(ogen), factor XIII, and red blood cells contribute to venous thrombus formation, structure, and stability may expose novel molecular targets and strategies for reducing thrombosis and thrombotic complications in certain at-risk patients. Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC, USA Correspondence to Alisa S. Wolberg, PhD, Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, 819 Brinkhous-Bullitt Building, CB #7525, Chapel Hill, NC 27599-7525, USA. Tel: +1 919 962 8943; fax: +1 919 966 6718; e-mail: email@example.com Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.