7269
Single-cell reverse transcriptase -polymerase chain reaction ( RT-PCR ) analysis was applied to this culture system to investigate gene expression of diverse receptors , markers of differentiation , and transcription factors ( EKLF , GATA-1 , GATA-2 , p45 NF-E2 , PU.1 , and SCL/Tal1 ) at discrete stages of erythropoietic development .
 ( protein: receptors, None) , ( protein: p45 NF-E2, None) , ( protein: GATA-1, None) , ( protein: markers of differentiation, None) , ( protein: reverse transcriptase, None) , ( protein: GATA-2, None) , ( protein: transcription factors, None) , ( protein: PU.1, None) , ( protein: SCL/Tal1, None) , ( protein: EKLF, 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: receptors, None) , ( protein: p45 NF-E2, None) , ( protein: GATA-1, None) , ( protein: markers of differentiation, None) , ( protein: reverse transcriptase, None) , ( protein: GATA-2, None) , ( protein: transcription factors, None) , ( protein: PU.1, None) , ( protein: SCL/Tal1, None) , ( protein: EKLF, None) 