tokens: Studies of cell lines representing endocrine , fibroblast , and lymphoid lineages using polyclonal antisera to detect E2A proteins have suggested that significant E2A protein expression is restricted to B-lymphocytes .
folded_tokens: studies of cell lines representing endocrine , fibroblast , and lymphoid lineages using polyclonal antisera to detect e2a proteins have suggested that significant e2a protein expression is restricted to b-lymphocytes .
labels: O O B-cell_line I-cell_line O O O O O O O O O B-other_organic_compound I-other_organic_compound O O B-protein_family_or_group I-protein_family_or_group O O O O B-protein_family_or_group I-protein_family_or_group O O O O B-cell_type O