tokens: However , the relationship remains controversial according to the tumor cell types and experimental system , with conflicting results from different research groups .
folded_tokens: however , the relationship remains controversial according to the tumor cell types and experimental system , with conflicting results from different research groups .
labels: O O O O O O O O O B-cell_type I-cell_type I-cell_type O B-other_name I-other_name O O O O O O O O O