8888
The exon:intron structure of chicken IL2 corresponds almost exactly to those of mammalian IL2s with the exceptions of exon 2 and introns 2 and 3 which are shorter.
 ( DNA: exon 2, None) , ( protein: chicken IL2, None) , ( protein: IL2s, None) , ( DNA: introns, None) , ( DNA: exon:intron structure, None) , ( protein: IL2, 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: exon 2, None) , ( protein: chicken IL2, None) , ( protein: IL2s, None) , ( DNA: introns, None) , ( DNA: exon:intron structure, None) , ( protein: IL2, None) 