PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 13631194-8 1959 When diluted back to the volume of parent plasma, to a concentration of 0.2 microgram nitrogen per ml., thrombokinase can slowly activate prothrombin in the presence of oxalate, and without the addition of accessory factors. Oxalates 169-176 coagulation factor II, thrombin Bos taurus 138-149 13631194-9 1959 Activation of prothrombin in the presence of oxalate is faster with higher concentrations of thrombokinase. Oxalates 45-52 coagulation factor II, thrombin Bos taurus 14-25