PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 1618758-6 1992 Second order rate constants for antithrombin reactions with thrombin and factor Xa were maximally enhanced by the pentasaccharide only 1.7-fold for thrombin, but a substantial 270-fold for factor Xa, in an ionic strength-independent manner at saturating oligosaccharide. Oligosaccharides 254-269 serpin family C member 1 Homo sapiens 32-44