8388
Proteins involved in repression of the human beta-globin gene may be useful in the treatment of sickle cell anemia , in conjunction with therapy to reactivate fetal globin genes .
 fetal globin genes, human beta-globin gene
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:
 fetal globin genes, human beta-globin gene