3728
The association of 20q deletions with myeloid "stem cell" disorders suggests that the deletions mark the site of one or more genes, loss or inactivation of which plays a role in the regulation of normal hematopoietic progenitors .
 ( cell type: normal hematopoietic progenitors, None) , ( DNA: 20q deletions, 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:
 ( cell type: normal hematopoietic progenitors, None) , ( DNA: 20q deletions, None) 