tokens: Viral gene expression may be reactivated by stimulation of the cells with LPS or cytokines such as TNF-alpha in vitro .
folded_tokens: viral gene expression may be reactivated by stimulation of the cells with lps or cytokines such as tnf-alpha in vitro .
labels: B-other_name I-other_name I-other_name O O O O O O O O O B-lipid O B-protein_family_or_group O O B-protein_molecule O O O