tokens: Epstein-Barr virus binding to CD21 activates the initial viral promoter via NF-kappaB induction .
folded_tokens: epstein-barr virus binding to cd21 activates the initial viral promoter via nf-kappab induction .
labels: B-virus I-virus O O B-protein_molecule O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-protein_complex O O