– Thrombin, which cleaves bonds after Arg and Lys, converts fibrinogen to fibrin and activates factors V, VII, VIII, XIII, and, in complex with thrombomodulin, protein C. Functions in blood homeostasis, inflammation and wound healing. Prothrombin Protein, Human, Recombinant (His) is expressed in yeast with N-6xHis tag. The predicted molecular weight is 67.3 kDa and the accession number is P00734.