| The adaptor protein , ankyrin 2 ( Ank 2 ) , and the cytoskeletal proteins , alpha fodrin and beta spectrin , also selectively co immunoprecipitated with NCX 1 , as did the ER proteins , Ca ( 2+ ) pump type 2 ( SERCA 2 ) , and inositol trisphosphate receptor type 1 ( IP ( 3 ) R 1 ) . ^^^ Antibodies to Ank 2 , alpha fodrin , beta spectrin and IP ( 3 ) R 1 all co immunoprecipitated NCX 1 . ^^^ |