9023
Clonality analysis of refractory anemia with ring sideroblasts : simultaneous study of clonality and cytochemistry of bone marrow progenitors .
 ( cell type: ring sideroblasts, None) , ( cell type: bone marrow progenitors, 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: ring sideroblasts, None) , ( cell type: bone marrow progenitors, None) 