Negative selection in the cortex appears to be a suicidal inversion of antigen responsiveness : instead of turning on IL-2 expression , the activated cell destroys its own chromatin .
negative selection in the cortex appears to be a suicidal inversion of antigen responsiveness : instead of turning on il-2 expression , the activated cell destroys its own chromatin .
B-other_name I-other_name O O B-body_part O O O O O O O B-other_name I-other_name O O O O O B-protein_molecule O O O B-cell_type I-cell_type O O O B-DNA_family_or_group O