tokens: CD4+ and CD8+ T cells differ in their beta-binding profiles , which may explain the more pronounced down-regulation of CD28 in senescent CD8+ T cells .
folded_tokens: cd4+ and cd8+ t cells differ in their beta-binding profiles , which may explain the more pronounced down-regulation of cd28 in senescent cd8+ t cells .
labels: O O B-cell_type I-cell_type I-cell_type O O O B-other_name I-other_name O O O O O O O O O B-protein_molecule O O B-cell_type I-cell_type I-cell_type O