4658
In vitro mutagenesis and transient transfection experiments indicate that the C-terminal serine / threonine / proline -rich region of BSAP contains a potent transactivation domain of 55 amino acids which is active from promoter and enhancer positions .
 ( protein: transactivation domain, None) , ( protein: C-terminal serine / threonine / proline -rich region, None) , ( protein: BSAP, 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: transactivation domain, None) , ( protein: C-terminal serine / threonine / proline -rich region, None) , ( protein: BSAP, None) 