PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 23692929-2 2013 Most cases are sporadic and caused by de novo PHOX2B gene mutations, which are usually polyalanine repeat expansions. polyalanine 87-98 paired-like homeobox 2b Mus musculus 46-52 18230845-3 2008 Recent work has associated polyalanine repeats within the PHOX2B gene on chromosome 4p12 with central congenital hypoventilation syndrome, whereas PHOX2B knockout mice develop aganglionic bowels. polyalanine 27-38 paired-like homeobox 2b Mus musculus 58-64