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Since the terminal events of erythropoiesis are controlled by the glycoprotein hormone erythropoietin ( Epo ), we investigated whether the expression or activity of the TAL1 gene and its protein products were affected by Epo in splenic erythroblasts from mice infected with an anemia-inducing strain of Friend virus (FVA cells).
 ( protein: Epo, None) , ( DNA: TAL1 gene, None) , ( protein: Epo, None) , ( protein: glycoprotein hormone erythropoietin, None) , ( protein: TAL1, None) , ( cell type: splenic erythroblasts, None) , ( protein: protein products, 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:
 ( protein: Epo, None) , ( DNA: TAL1 gene, None) , ( protein: Epo, None) , ( protein: glycoprotein hormone erythropoietin, None) , ( protein: TAL1, None) , ( cell type: splenic erythroblasts, None) , ( protein: protein products, None) 