PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 12754883-2 2003 The focus on their regulatory and environmental aspects has been intensified due to the elevated levels of ammonium salts in the national water system, resulting in a banning of water use in the Dan district. ammonium salts 107-121 NBL1, DAN family BMP antagonist Homo sapiens 195-198