tokens: The mouse mammary tumor virus env gene contains a transcriptional activator ( META ) that can control transcription of the adjacent long terminal repeat region .
folded_tokens: the mouse mammary tumor virus env gene contains a transcriptional activator ( meta ) that can control transcription of the adjacent long terminal repeat region .
labels: O B-virus I-virus I-virus I-virus B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O