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. 2019 May 16;9(5):190. doi: 10.3390/biom9050190

Figure 2.

Figure 2

There are many unknown elements in the 20S proteasome degradation pathway. The scheme summarizes the different substrate groups, 20S proteasome forms, activators, inhibitors, and shuttle proteins, and point toward the many entities among these players that are yet to be discovered. HSP70: heat shock protein 70, IDR: intrinsically disordered proteins, PTM: post translational modification.