passages.id: split_8_test_2445_passage
passages.type: progene_text
passages.text: Expressed in Xenopus oocytes , FXYD7 can interact with Na , K - ATPase alpha 1 - beta 1 , alpha 2-beta 1 and alpha 3 - beta 1 but not with alpha-beta 2 isozymes , whereas , in brain , it is only associated with alpha 1 - beta isozymes .