6049
By functionally expressing receptor mutants in the murine pro-B cell line Ba/F3 , we could show that phosphorylated tyrosine residues within the IL-4R alpha chain are dispensable for IL-4 -induced STAT5 activity .
 STAT5, Ba/F3, IL-4R alpha chain, receptor mutants, murine pro-B cell line, IL-4
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:
 STAT5, Ba/F3, IL-4R alpha chain, receptor mutants, murine pro-B cell line, IL-4