PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 3327411-1 1987 Ricin A chain, a potent ribosomal poison, was disulfide linked either to the iron transport protein, transferrin, or to anti-transferrin receptor antibodies to produce highly specific derivative toxins, Tf-A and TfR-A, respectively. Disulfides 46-55 coagulation factor III, tissue factor Homo sapiens 203-207