9031
Our findings suggest that non-clonal progenitor cells persist in some RARS cases, that erythroid progenitors show mosaicism, and that ringed sideroblasts may be derived from an abnormal clone involved in the pathogenesis of this disease.
 ( cell type: erythroid progenitors, None) , ( cell type: RARS, None) , ( cell type: ringed sideroblasts, None) , ( cell type: non-clonal progenitor 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:
 ( cell type: erythroid progenitors, None) , ( cell type: RARS, None) , ( cell type: ringed sideroblasts, None) , ( cell type: non-clonal progenitor cells, None) 