tokens: The nature of CD40 -dependent signals in proliferating fresh human Epstein-Barr virus -negative B lymphocytes is currently unknown .
folded_tokens: the nature of cd40 -dependent signals in proliferating fresh human epstein-barr virus -negative b lymphocytes is currently unknown .
labels: O O O B-protein_molecule O O O O O B-cell_line B-virus I-virus O O O O O O O