7239
Both alpha- and beta-bound complexes are found only in lymphoid tissues , in CD28+ T cells , and in some transformed B cells .
 ( cell type: CD28+ T cells, None) , ( cell line: transformed B cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: CD28+ T cells, None) , ( cell line: transformed B cells, None) 