9027
The development of ringed sideroblasts in erythroid colonies by iron staining and their X-inactivation pattern were also examined.
 erythroid colonies, ringed sideroblasts
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 erythroid colonies, ringed sideroblasts