A 14-year-old male with a history of mild macrocytic anemia, jaundice, and splenomegaly is diagnosed with a congenital dyserythropoietic anemia (CDA). His bone marrow shows erythroid hyperplasia with 15% binucleated erythroblasts. Red blood cell membrane protein analysis by SDS-PAGE is ordered. Which finding would be most consistent with congenital dyserythropoietic anemia type II?