PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2007367-7 1991 Both carbamoylphosphate synthetase-I and glutamine synthetase, the ammonia-metabolizing enzymes, are expressed by all pancreatic hepatocytes; in liver, these are expressed by different populations of hepatocytes. Ammonia 67-74 glutamate-ammonia ligase Rattus norvegicus 41-61