tokens: In addition , the procedure described herein could prove useful in other cell types that express high levels of endogenous proteases .
folded_tokens: in addition , the procedure described herein could prove useful in other cell types that express high levels of endogenous proteases .
labels: O O O O O O O O O O O O O O O O O O O B-protein_family_or_group I-protein_family_or_group O