passages.id: split_6_test_2604_passage
passages.type: progene_text
passages.text: The calcineurin B homologous protein ( designated CHP1 ) has been shown to be a common essential cofactor for the plasma membrane Na(+) / H(+) exchangers ( NHEs ) ( Pang , T. , Su , X. , Wakabayashi , S. , and Shigekawa , M. ( 2001 ) J. Biol. Chem. 276 , 17367 - 17372 ) .