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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 .
 Ras(G12V), erythropoietin receptor mutant, Ras, Stat5, beta-casein, mutant erythropoietin receptor, beta-casein promoter, Ras
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 Ras(G12V), erythropoietin receptor mutant, Ras, Stat5, beta-casein, mutant erythropoietin receptor, beta-casein promoter, Ras