9025
In the present study, the clonal relationship was investigated between peripheral blood polymorphonuclear cells ( PMNCs ) and marrow progenitor cells and the origin of ringed sideroblasts in patients with refractory anemia with ring sideroblasts ( RARS ) by polymerase chain reaction ( PCR ) of HUMARA gene .
 ( cell type: peripheral blood polymorphonuclear cells, None) , ( cell type: PMNCs, None) , ( DNA: HUMARA gene, None) , ( cell type: ring sideroblasts, None) , ( cell type: ringed sideroblasts, None) , ( cell type: RARS, None) , ( cell type: marrow 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: peripheral blood polymorphonuclear cells, None) , ( cell type: PMNCs, None) , ( DNA: HUMARA gene, None) , ( cell type: ring sideroblasts, None) , ( cell type: ringed sideroblasts, None) , ( cell type: RARS, None) , ( cell type: marrow progenitor cells, None) 