tokens: The exact role of these different proteins in directing the tissue-specific expression of immunoglobulin genes is unclear .
folded_tokens: the exact role of these different proteins in directing the tissue-specific expression of immunoglobulin genes is unclear .
labels: O O O O O O O O O O B-other_name I-other_name O B-DNA_family_or_group I-DNA_family_or_group O O O