7294
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 .
 ( cell line: vitro-differentiated embryonic stem cells, None) , ( cell line: committed erythroid precursors, None) , ( protein: GATA-1, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell line: vitro-differentiated embryonic stem cells, None) , ( cell line: committed erythroid precursors, None) , ( protein: GATA-1, None) 