tokens: A procedure suitable for cloning labile mRNAs that contain AU motifs is presented ( AU-DD ) .
folded_tokens: a procedure suitable for cloning labile mrnas that contain au motifs is presented ( au-dd ) .
labels: O O O O B-RNA_family_or_group I-RNA_family_or_group I-RNA_family_or_group O O B-RNA_substructure I-RNA_substructure O O O B-RNA_substructure O O