14717
In contrast to wild-type B cells , neither of the class II mutant cell lines could use the X box region to direct the expression of a transiently transfected reporter gene , indicating that the X box-dependent transcriptional pathway is defective in these cells.
 ( DNA: X box region, None) , ( cell line: class II mutant cell lines, None) , ( DNA: reporter gene, None) , ( cell line: wild-type B cells, 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: X box region, None) , ( cell line: class II mutant cell lines, None) , ( DNA: reporter gene, None) , ( cell line: wild-type B cells, None) 