tokens: The tissue-specific expression of the MOPC 141 immunoglobulin heavy-chain gene was studied by using in vitro transcription .
folded_tokens: the tissue-specific expression of the mopc 141 immunoglobulin heavy-chain gene was studied by using in vitro transcription .
labels: O B-other_name I-other_name O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O B-other_name I-other_name O