13763
We recently determined that erythropoietin ( EPO ) activates 3 members of the signal transducer and activator of transcription (STAT) family, Stat1alpha , Stat3 , and Stat5 , in the human EPO -dependent cell lines , UT-7 and UT-7/ EPO (Kirito et al, J Biol Chem 272:16507, 1997).
 ( protein: Stat3, None) , ( protein: EPO, None) , ( cell line: UT-7, None) , ( protein: Stat1alpha, None) , ( cell line: UT-7/ EPO, None) , ( protein: EPO, None) , ( cell line: human EPO -dependent cell lines, None) , ( protein: EPO, None) , ( protein: Stat5, None) , ( protein: erythropoietin, 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: Stat3, None) , ( protein: EPO, None) , ( cell line: UT-7, None) , ( protein: Stat1alpha, None) , ( cell line: UT-7/ EPO, None) , ( protein: EPO, None) , ( cell line: human EPO -dependent cell lines, None) , ( protein: EPO, None) , ( protein: Stat5, None) , ( protein: erythropoietin, None) 