14085
Sequence analysis of nineteen LTRs cloned from 2 adult and 3 pediatric patients revealed an average of 33 nucleotide changes (with respect to the sequence of the LAI LTR ) within the 455-bp U3 region .
 ( DNA: LTR, None) , ( DNA: LAI LTR, None) , ( DNA: 455-bp U3 region, None) , ( DNA: LTRs, 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: LTR, None) , ( DNA: LAI LTR, None) , ( DNA: 455-bp U3 region, None) , ( DNA: LTRs, None) 