Anticlotting properties of fragments D from human fibrinogen and fibrin

Abstract
Ca2+ concentrations comparable to those in blood apparently protect the C-terminal part of the .gamma.-chain remnants of fibrin(ogen) fragments D against further plasmin attack. In this study purified fibrin(ogen) fragments D formed in presence of Ca2+ ions had anticlotting activity in vitro, whereas shortening .gamma.-chain remnants leads to loss of such activity.