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Assembly pathways of the immunoproteasome, the thymoproteasome, and the standard CP. (A) Assembly pathway of the immunoproteasome and the thymoproteasome started with incorporation of β1i and β2i, followed by β3 and β4. Both β5i and β5t can also be incorporated immediately after β3. β6 and β7 were the last two subunits to be incorporated; (B) Assembly pathway of the standard CP for reference.
