10968
A shortened life span of EKLF-/- adult erythrocytes , due to a deficiency of beta-globin chains , is ameliorated by human gamma-globin chains .
 ( cell type: EKLF-/- adult erythrocytes, None) , ( protein: human gamma-globin chains, None) , ( protein: beta-globin chains, 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 type: EKLF-/- adult erythrocytes, None) , ( protein: human gamma-globin chains, None) , ( protein: beta-globin chains, None) 