7078
The Tax mutants M22 and M47 have previously been demonstrated to selectively abrogate the ability of Tax to activate transcription through the NF-kappaB or CREB/ATF pathway , respectively.
 ( protein: Tax mutants, None) , ( protein: Tax, None) , ( protein: M47, None) , ( protein: M22, None) , ( 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:
 ( protein: Tax mutants, None) , ( protein: Tax, None) , ( protein: M47, None) , ( protein: M22, None) , ( protein: Tax, None) 