tokens: In vivo genomic footprinting had also revealed cell-specific binding of protein , presumably Sp1 , to these regions .
folded_tokens: in vivo genomic footprinting had also revealed cell-specific binding of protein , presumably sp1 , to these regions .
labels: B-other_name I-other_name I-other_name I-other_name O O O O O O O O O B-protein_molecule O O O O O