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Such hypermethylation-associated silencing of gene expression has been shown for several genes regulating the growth and differentiation of hematopoietic cells , including the estrogen receptor (ER) gene , P15, P16 and others.
 estrogen receptor (ER) gene, hematopoietic cells
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:
 estrogen receptor (ER) gene, hematopoietic cells