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. 2017 Aug 9;8:927. doi: 10.3389/fimmu.2017.00927

Figure 2.

Figure 2

Normal function of the proteasome. (A) A waste protein fated to elimination is marked with ubiquitin. (B) The 19S complex recognizes the ubiquitinated protein. (C) The ubiquitinated waste protein is entered into the proteasome. (D) The catalytic activity of the 20S complex renders small products, easy to remove from the cell.