tokens: In addition , we show that TNF-alpha is a potent costimulatory factor of the very immature CD34+Thy-1+ CB subset .
folded_tokens: in addition , we show that tnf-alpha is a potent costimulatory factor of the very immature cd34+thy-1+ cb subset .
labels: O O O O O O B-protein_molecule O O O O O O O O B-cell_line I-cell_line I-cell_line I-cell_line O