TAPP2 associates with the utrophin/syntrophin complex. NP-40 extracts from BJAB (A) or JVM-3 (B) cells were immunoprecipitated and blotted as indicated, demonstrating that the utrophin-syntrophin complex forms in lymphocytes and associates with TAPP2. rIg indicates rabbit IgG control; mIg, mouse IgG control.