1605
Purified human SP1 was shown to have very strong affinity for the 12-bp insert .
 ( protein: human SP1, None) , ( DNA: 12-bp insert, 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: human SP1, None) , ( DNA: 12-bp insert, None) 