PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 16463-6 1977 We conclude that the release of catecholamines by these histamine H2-receptor antagonists is probably due to their cationic (imidazolium) forms. Catecholamines 32-46 histamine receptor H 2 Rattus norvegicus 56-77