proteasome

noun
pro·te·a·some | \ˈprō-tē-ə-ˌsōm \

Medical Definition of proteasome 

: a hollow, cylindrical cellular structure that is a complex of proteases involved in the selective degradation of intracellular proteins and especially proteins marked for proteolysis by ubiquitin Tagged proteins are then fed into the proteasome, a barrel-shaped multi-protein complex that chops proteins down into their component amino acids for reuse.— Caroline Williams, New Scientist, 2 Sept. 2006

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