PSMB8 and neoplasm: Hence, we studied the amount of 20S proteasome alpha subunits (α1, α2, α3, α5, α6, α7) and immunoproteasome subunits (LMP-2 and LMP-7), as well as the quantity of 19S and 11Sαβ regulator subunits in tumor tissues by Western blotting (Figure 4d).