9027
The development of ringed sideroblasts in erythroid colonies by iron staining and their X-inactivation pattern were also examined.
 ( cell line: erythroid colonies, None) , ( cell type: ringed sideroblasts, 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 line: erythroid colonies, None) , ( cell type: ringed sideroblasts, None) 