4285
Importantly, two previously characterized mutants with point mutations in Tax , M32 ( Y196A , K197S ) and M41 ( H287A , P288S ), which were shown to be defective in Tax -activated transcription were unable to interact with TFIIA in this assay.
 ( protein: TFIIA, None) , ( protein: M32, None) , ( protein: mutants, None) , ( protein: Tax, None) , ( protein: M41, 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: TFIIA, None) , ( protein: M32, None) , ( protein: mutants, None) , ( protein: Tax, None) , ( protein: M41, None) , ( protein: Tax, None) 