12323
Since both these proteins become phosphorylated in response to IL-4 receptor stimulation , the influence of tyrosine phosphorylation on their mutual contact was analyzed.
 IL-4 receptor
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:
 IL-4 receptor