Claim: A multicatalytic proteinase complex found inside all eukaryotes and archaea, proteasome subunit beta type-2 is distributed throughout eukaryotic cells in an ATP/ubiquitin-dependent process.
Evidence: The proteasome is a multicatalytic proteinase complex with a highly ordered 20S core structure. Proteasomes are distributed throughout eukaryotic cells at a high concentration and cleave peptides in an ATP/ubiquitin-dependent process in a non-lysosomal pathway. Proteasomes are found inside all eukaryotes and archaea, and in some bacteria.