Using in vivo genomic footprinting we identified interactions in B-cell lines at the octamer site and the Y , X1 , and X2 boxes .
using in vivo genomic footprinting we identified interactions in b-cell lines at the octamer site and the y , x1 , and x2 boxes .
O B-other_name I-other_name I-other_name I-other_name O O O O B-cell_line I-cell_line O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O O O