tokens: Both alpha- and beta-bound complexes are found only in lymphoid tissues , in CD28+ T cells , and in some transformed B cells .
folded_tokens: both alpha- and beta-bound complexes are found only in lymphoid tissues , in cd28+ t cells , and in some transformed b cells .
labels: O O O O O O O O O B-tissue I-tissue O O B-cell_type I-cell_type I-cell_type O O O O B-cell_line I-cell_line I-cell_line O