12811
In addition, Ras(G12V) complemented signaling by an erythropoietin receptor mutant defective in Ras activation and augmented the activation of the beta-casein promoter by the mutant erythropoietin receptor signaling , suggesting a possible role of Ras in Stat5 -mediated gene expression .
 ( protein: Ras(G12V), None) , ( protein: erythropoietin receptor mutant, None) , ( protein: Ras, None) , ( protein: Stat5, None) , ( protein: beta-casein, None) , ( protein: mutant erythropoietin receptor, None) , ( DNA: beta-casein promoter, None) , ( protein: Ras, 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: Ras(G12V), None) , ( protein: erythropoietin receptor mutant, None) , ( protein: Ras, None) , ( protein: Stat5, None) , ( protein: beta-casein, None) , ( protein: mutant erythropoietin receptor, None) , ( DNA: beta-casein promoter, None) , ( protein: Ras, None) 