8088
(4) Intrafollicular CD57+ cells were negative for Bcl-6 , indicating heterogeneity of the intrafollicular T-cell population .
 ( cell type: intrafollicular T-cell population, None) , ( cell type: Intrafollicular CD57+ cells, None) , ( protein: Bcl-6, 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: intrafollicular T-cell population, None) , ( cell type: Intrafollicular CD57+ cells, None) , ( protein: Bcl-6, None) 