tokens: The maintenance of lymphocyte homeostasis by apoptosis is a critical regulatory mechanism in the normal immune system .
folded_tokens: the maintenance of lymphocyte homeostasis by apoptosis is a critical regulatory mechanism in the normal immune system .
labels: O O O B-other_name I-other_name O B-other_name O O B-other_name I-other_name I-other_name O O B-body_part I-body_part I-body_part O