It has been suggested that the ubiquitin -proteasome system is involved in the process ; however , the specific enzymes involved and the mechanism of limited proteolysis , in which half of the molecule is spared , have been obscure .
it has been suggested that the ubiquitin -proteasome system is involved in the process ; however , the specific enzymes involved and the mechanism of limited proteolysis , in which half of the molecule is spared , have been obscure .
O O O O O O B-protein_molecule B-protein_complex O O O O O O O O O O O B-protein_family_or_group O O O O O O B-other_name O O O O O O O O O O O O O O