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Structure of 26S proteasome. 26S proteasome comprises a 20S core flanked by regulatory particles (19S). The 20S core includes four heptameric rings of α or β subunits. The proteolytic sites with caspase-like, trypsin-like and chymotrypsin-like activity are located in the subunits β1, β2 and β5, respectively.
Source: Chhabra et al.14
