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The proximal sequence element (PSE)-binding transcription factor ( PTF ), which binds the PSE of both RNA polymerase II -and RNA polymerase III -transcribed mammalian small nuclear RNA (snRNA) genes , is essential for their transcription.
 ( DNA: PSE, None) , ( DNA: mammalian small nuclear RNA (snRNA) genes, None) , ( protein: RNA polymerase III, None) , ( protein: proximal sequence element (PSE)-binding transcription factor, None) , ( DNA: RNA polymerase II -and RNA polymerase III -transcribed mammalian small nuclear RNA (snRNA) genes, None) , ( protein: PTF, None) , ( protein: RNA polymerase II, 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: PSE, None) , ( DNA: mammalian small nuclear RNA (snRNA) genes, None) , ( protein: RNA polymerase III, None) , ( protein: proximal sequence element (PSE)-binding transcription factor, None) , ( DNA: RNA polymerase II -and RNA polymerase III -transcribed mammalian small nuclear RNA (snRNA) genes, None) , ( protein: PTF, None) , ( protein: RNA polymerase II, None) 