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In addition, we show that erythropoietin , which is also required for erythroid cell survival , cooperates with GATA-1 to stimulate bcl-xL gene expression and to maintain erythroid cell viability during terminal maturation .
 GATA-1, bcl-xL, erythropoietin
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:
 GATA-1, bcl-xL, erythropoietin