“…The conversion of fibrinogen to fibrin is the end result of intravascular coagulation from whatever cause, i.e. obstetrical defibrination (McKay, Merrill, Weiner, Hertig and Reid, 1953 ;Vassalli, Morris and McCluskey, 1963 ;Willoughby, 1966), the release of tissue thromboplastins from normal or tumour tissue (Godal and Abildgaard, 1963 ;Miller and Davison, 1967), as a result of antigen-antibody reactions (Gerber, 1936;Robbins and Stetson, 1959) and the release of red-cell thromboplastins from enzymatically damaged red blood cells (Rubenberg, Baker, McBride, Sevitt and Brain, 1968).…”