tokens: In the immune system the first activation of a naive T cell by antigen is a key step in the shaping of the peripheral T cell specificity repertoire and maintenance of self-tolerance .
folded_tokens: in the immune system the first activation of a naive t cell by antigen is a key step in the shaping of the peripheral t cell specificity repertoire and maintenance of self-tolerance .
labels: O O O O O O O O O B-cell_type I-cell_type I-cell_type O O O O O O O O O O O B-other_name I-other_name I-other_name I-other_name O O O O O O