2297
Because of the theoretical potential of such sequences supporting replication of E1a- Ad vectors , human gene therapy protocols for CF utilizing such vectors should consider evaluating study individuals for the presence of Ad 2/5 E1a sequences in the respiratory epithelium .
 ( DNA: E1a sequences, None) , ( DNA: Ad 2/5 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) , ( DNA: Ad 2/5 E1a sequences, None) 