tokens: So called costimulatory signals , mediated by other cell surface interactions or soluble cytokines produced by antigen presenting cells , are also required for complete T cell activation .
folded_tokens: so called costimulatory signals , mediated by other cell surface interactions or soluble cytokines produced by antigen presenting cells , are also required for complete t cell activation .
labels: O O B-other_name I-other_name O O O O O O O O B-protein_family_or_group I-protein_family_or_group O O B-cell_type I-cell_type I-cell_type O O O O O O B-other_name I-other_name I-other_name O