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We extended these studies using a novel primary human adult erythroid cell ( hAEC ) system to investigate these effects at the late erythroblast stage .
 ( cell line: hAEC, None) , ( cell line: primary human adult erythroid cell, None) , ( cell line: primary human adult erythroid cell ( hAEC ) system, None) , ( cell type: late erythroblast stage, 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: hAEC, None) , ( cell line: primary human adult erythroid cell, None) , ( cell line: primary human adult erythroid cell ( hAEC ) system, None) , ( cell type: late erythroblast stage, None) 