1680
The human platelet-activating factor receptor ( PAFR ) gene is transcribed by two distinct promoters ( promoter 1 and promoter 2 ) to generate two transcripts (designated as PAFR transcript 1 and PAFR transcript 2 ), though their open reading frames are identical.
 ( protein: PAFR, None) , ( protein: human platelet-activating factor receptor, None) , ( DNA: human platelet-activating factor receptor ( PAFR ) gene, None) , ( protein: PAFR, None) , ( RNA: PAFR transcript 2, None) , ( DNA: promoter 2, None) , ( DNA: promoter 1, None) , ( protein: PAFR, None) , ( DNA: promoters, None) , ( RNA: PAFR transcript 1, 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: PAFR, None) , ( protein: human platelet-activating factor receptor, None) , ( DNA: human platelet-activating factor receptor ( PAFR ) gene, None) , ( protein: PAFR, None) , ( RNA: PAFR transcript 2, None) , ( DNA: promoter 2, None) , ( DNA: promoter 1, None) , ( protein: PAFR, None) , ( DNA: promoters, None) , ( RNA: PAFR transcript 1, None) 