1719
The severe phenotype of females with tiny ring X chromosomes is associated with inability of these chromosomes to undergo X inactivation .
 ( DNA: tiny ring X chromosomes, None) , ( DNA: chromosomes, None) , ( DNA: X chromosomes, 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: tiny ring X chromosomes, None) , ( DNA: chromosomes, None) , ( DNA: X chromosomes, None) 