11073
EMS analyses utilizing a series of mutated pp repeat elements demonstrate that the nucleotide sequence requirements for U1 ( U1A/U1B ) and U2 formation are separable from those required for C1-C3 formation .
 ( DNA: C1-C3, None) , ( DNA: mutated pp repeat elements, None) , ( DNA: U1A/U1B, None) , ( DNA: U2, None) , ( DNA: U1, 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: C1-C3, None) , ( DNA: mutated pp repeat elements, None) , ( DNA: U1A/U1B, None) , ( DNA: U2, None) , ( DNA: U1, None) 