PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 7202943-2 1981 The distribution of histamine in the various density-gradient fractions was highly correlated with that for both histidine decarboxylase and DOPA-decarboxylase. Histamine 20-29 dopa decarboxylase Rattus norvegicus 141-159