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We have analyzed de novo radiation-induced translocations between the Xi and autosomes to study the maintenance and spreading of X-chromosome inactivation ( X inactivation ) in relation to the position of the X-inactivation center (XIC)/XIST in differentiated cells .
 ( DNA: autosomes, None) , ( cell type: differentiated cells, None) , ( DNA: (XIC)/XIST, None) , ( DNA: Xi, None) , ( DNA: X-chromosome, 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: autosomes, None) , ( cell type: differentiated cells, None) , ( DNA: (XIC)/XIST, None) , ( DNA: Xi, None) , ( DNA: X-chromosome, None) 