14715
To further evaluate the role of X box DNA-binding proteins in class II gene expression , the role of the X box region was examined in both class II-positive and -negative lymphoid cells .
 ( DNA: class II gene, None) , ( DNA: X box region, None) , ( cell line: -negative lymphoid cells, None) , ( cell line: class II-positive, None) , ( protein: X box DNA-binding proteins, 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: X box region, None) , ( cell line: -negative lymphoid cells, None) , ( cell line: class II-positive, None) , ( protein: X box DNA-binding proteins, None) 