tokens: The CD19 protein is expressed on the surface of all B-lymphoid cells with the exception of terminally differentiated plasma cells and has been implicated as a signal-transducing receptor in the control of proliferation and differentiation .
folded_tokens: the cd19 protein is expressed on the surface of all b-lymphoid cells with the exception of terminally differentiated plasma cells and has been implicated as a signal-transducing receptor in the control of proliferation and differentiation .
labels: O B-protein_molecule I-protein_molecule O O O O O O O B-cell_type I-cell_type O O O O B-cell_type I-cell_type I-cell_type I-cell_type O O O O O O O O O O O O O O O O