4870
The viral protein Tax was likely responsible for this higher level of class II gene transcription , as purified Tax was found to stimulate both genes when added to the uninfected cell extract or in reconstituted systems .
 ( DNA: class II gene, None) , ( protein: purified Tax, None) , ( protein: viral protein Tax, 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:
 ( DNA: class II gene, None) , ( protein: purified Tax, None) , ( protein: viral protein Tax, None) 