tokens: The pp52 promoter contains an initiator specifying the unique 5' terminus of pp52 mRNA , tandem pairs of Ets and SP1 motifs , and a lone C/EBP motif .
folded_tokens: the pp52 promoter contains an initiator specifying the unique 5' terminus of pp52 mrna , tandem pairs of ets and sp1 motifs , and a lone c/ebp motif .
labels: O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-RNA_molecule I-RNA_molecule O O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O