Fibrin

(ft-brin) [fbra, a fiber]. A proteid formed in shed blood, lymph, in other body-fluids, and in ti ues when these coagulate. It exists in the shape of fibrils, granules, plates, or as a homogeneous material. Fibrin forms about 0.2 per cent, of the blood. F.- factors, the substances nece ary for and concerned in the formation of fibrin. They are fibrinogen, fibrin -ferment, and certain salts. F. -ferment, a ferment obtained from blood-serum after clotting has occurred. It is one of the fibrin-factors, and is probably derived from the leukocytes. 276