passages.id: split_6_test_2606_passage
passages.type: progene_text
passages.text: CHP2 , like CHP1 , conferred the ability to NHEs 1-3 to express a high exchange activity by binding to the juxtamembrane region of the cytoplasmic domain of the exchanger , but it interacts more strongly ( approximately 5 - fold ) with NHE1 than does CHP1 .