10968
A shortened life span of EKLF-/- adult erythrocytes , due to a deficiency of beta-globin chains , is ameliorated by human gamma-globin chains .
 EKLF-/- adult erythrocytes, human gamma-globin chains, beta-globin chains
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:
 EKLF-/- adult erythrocytes, human gamma-globin chains, beta-globin chains