PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 1380468-1 1992 Purified alpha 2-macroglobulin and complement proteins C3 and C4 were treated with ammonia to break their intramolecular thioester bonds and reform the original free cysteinyl and glutamyl side chains. lysyl-cysteinyl-cysteinyl-arginyl-cysteinyl-lysine 166-175 complement C3 Homo sapiens 55-64