( 1975 ) [ in prothrombin and related coagulation factors , ( hember , h. c. & veltkamp , j. j. , eds . ) , pp . 25-46 , leiden university press , leiden ] , indicated that proteolysis occurred at the arg ( 78 ) -lys ( 79 ) peptide bond of the b chain of a precursor molecular species , thus converting this two-chain species into the three-chain active form described here .
C0033706
prothrombin
C0005789
coagulation factors