1314
To study this element and its role in class II gene regulation further, a cDNA library was screened with oligonucleotide probes containing both the S element and the nearby J element of the human DPA gene .
 ( DNA: class II gene, None) , ( DNA: cDNA library, None) , ( DNA: S element, None) , ( DNA: J element, None) , ( DNA: human DPA gene, 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: class II gene, None) , ( DNA: cDNA library, None) , ( DNA: S element, None) , ( DNA: J element, None) , ( DNA: human DPA gene, None) 