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By examining in vitro-differentiated embryonic stem cells , we showed previously that in the absence of GATA-1 , committed erythroid precursors fail to complete maturation and instead undergo apoptosis .
 vitro-differentiated embryonic stem cells, committed erythroid precursors, GATA-1
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:
 vitro-differentiated embryonic stem cells, committed erythroid precursors, GATA-1