7272
In late stages of erythroid maturation, GPA was upregulated, whereas CD34 , c-kit , PU.1 , and GATA-2 were barely or not detected.
 ( protein: GPA, None) , ( protein: c-kit, None) , ( protein: PU.1, None) , ( protein: GATA-2, None) , ( protein: CD34, 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: GPA, None) , ( protein: c-kit, None) , ( protein: PU.1, None) , ( protein: GATA-2, None) , ( protein: CD34, None) 