tokens: B cells were purified from buffy coat preparations of healthy blood donors by positive selection using an anti CD20 monoclonal antibody and a MiniMACS separation unit .
folded_tokens: b cells were purified from buffy coat preparations of healthy blood donors by positive selection using an anti cd20 monoclonal antibody and a minimacs separation unit .
labels: B-cell_type I-cell_type O O O B-other_organic_compound I-other_organic_compound I-other_organic_compound O B-multi_cell I-multi_cell I-multi_cell O O O O O B-protein_molecule B-protein_molecule O O O O B-other_name I-other_name I-other_name O