SPTB and Diamond-Blackfan anemia: Interestingly, major RBC membrane proteins including α-spectrin (SPTA), β-spectrin (SPTB), band 3 (SLC4A1), α-adducin (ADD1), glycophorin A (GYPA), band 4.1 (EPB41), band 4.2 (EPB42), stomatin (STOM), ankyrin (ANK1), and β-actin (ACTB) did not show significant changes in abundance in DBA patients (Tables 2 and 3, Figure 2).