14002
However, its interactions with these histone acetyltransferases are not equivalent, as CBP and p300 , but not P/CAF , utilize EKLF as a substrate for in vitro acetylation within its trans- activation region .
 ( protein: EKLF, None) , ( protein: histone acetyltransferases, None) , ( protein: p300, None) , ( protein: P/CAF, None) , ( protein: CBP, None) , ( protein: activation region, 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: EKLF, None) , ( protein: histone acetyltransferases, None) , ( protein: p300, None) , ( protein: P/CAF, None) , ( protein: CBP, None) , ( protein: activation region, None) 