PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 3139401-5 1988 When the amounts of added tPA and analogues were standardized so that each generated the same absorbance in a chromogenic assay containing S-2251, plasminogen, and fibrinogen fragments, there was a significant difference in the way in which the analogues were titrated by the inhibitor. valyl-leucyl-lysine 4-nitroanilide 139-145 chromosome 20 open reading frame 181 Homo sapiens 26-29