tokens: In this study we identified a sequence element present in the most proximal region located between bases -214 and -201 , TTCTTCTAATTAA , which is important in the high constitutive expression of CD20 in mature B cells and the induction of CD20 in pre-B cells .
folded_tokens: in this study we identified a sequence element present in the most proximal region located between bases -214 and -201 , ttcttctaattaa , which is important in the high constitutive expression of cd20 in mature b cells and the induction of cd20 in pre-b cells .
labels: O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O O O O O O B-polynucleotide O O O O O O O O O O B-protein_molecule O O O O O O O O B-protein_molecule O B-cell_type I-cell_type O