tokens: However , the cytotoxic T lymphocyte ( CTL ) response to Ad could limit the effectiveness of such approaches .
folded_tokens: however , the cytotoxic t lymphocyte ( ctl ) response to ad could limit the effectiveness of such approaches .
labels: O O O B-cell_type I-cell_type I-cell_type O B-cell_type O O O B-virus O O O O O O O O