3760
These data along with previous observations demonstrating the potent immunosuppressive activity of TGF-beta 2 , support a model for a feedback mechanism between the activated T-lymphocytes and astrocytes via TGF-beta 2 to regulate the immune response .
 ( cell type: astrocytes, None) , ( protein: TGF-beta 2, None) , ( cell type: T-lymphocytes, None) , ( protein: TGF-beta 2, 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: astrocytes, None) , ( protein: TGF-beta 2, None) , ( cell type: T-lymphocytes, None) , ( protein: TGF-beta 2, None) 