tokens: Detailed histogenetic characterization of these novel PEL cell lines suggests that PEL may derive from a post-germinal centre B cell which has undergone pre-terminal differentiation .
folded_tokens: detailed histogenetic characterization of these novel pel cell lines suggests that pel may derive from a post-germinal centre b cell which has undergone pre-terminal differentiation .
labels: O O O O O O B-cell_line I-cell_line I-cell_line O O B-cell_line O O O O B-cell_line I-cell_line I-cell_line I-cell_line O O O B-other_name I-other_name O