2128
Central nervous system -derived cells express a kappa B-binding activity that enhances human immunodeficiency virus type 1 transcription in vitro and facilitates TAR -independent transactivation by Tat .
 ( cell type: Central nervous system -derived cells, None) , ( protein: Tat, None) , ( DNA: TAR, 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: Central nervous system -derived cells, None) , ( protein: Tat, None) , ( DNA: TAR, None) 