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However, these cells have been impossible to generate given the requirement of GATA-1 for Epo receptor expression and red cell viability (C. Simon and S. Orkin, unpublished observations).
 Epo receptor, GATA-1, red cell
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:
 Epo receptor, GATA-1, red cell