1) Peptide 
(from the article `evolution`) Proteins that evolve more rapidly than cytochrome c can be studied in order to establish phylogenetic relationships between closely related species. ...
<protein> Very negatively charged peptide fragments cleaved from fibrinogen by thrombin. Two peptides (A and B) are produced from each fibrinogen molecule. ... A: This is released as a part of the clotting process. Increased levels may be seen in DIC, lupus, cellulitis and leukaemia. ... (09 Oct 1997) ... 
(fi″brĭ-no-pep´tīd) either of two peptides (A and B) split off from fibrinogen during blood clotting by the action of thrombin.
Type: Term Pronunciation: fī′brin-ō-pep′tīd Definitions: 1. One of two pairs of peptides (A and B) released from the amino-terminal ends of 2α- (or Aα-) and 2β- (or Bβ-)chains of fibrinogen by the action of thrombin to form fibrin; they have a vasoconstrictive effect.
[n] - peptide released from the amino end of fibrinogen by the action of thrombin to form fibrin during clotting of the blood
noun peptide released from the amino end of fibrinogen by the action of thrombin to form fibrin during clotting of the blood