2295
In CF individuals , 7 of 52 (13%) had detectable E1a sequences in the respiratory epithelium , with E1a copy number in the positive samples of 80 +/- 21/10(3) recovered cells.
 ( DNA: E1a sequences, 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: E1a sequences, None) 