PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2554786-6 1989 The addition of ferrous chloride to the culture medium increased the cytotoxicity of GLA in tumorigenic but not in non-tumorigenic variants. ferrous chloride 16-32 galactosidase, alpha Rattus norvegicus 85-88