1620
Inducible binding to the c-fos serum response element during T cell activation is regulated by a phosphotyrosine-containing protein .
 phosphotyrosine-containing protein
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:
 phosphotyrosine-containing protein