12805
We have found that the beta-casein gene is expressed in a cytotoxic T cell line , CTLL-2 , in response to interleukin-2 ( IL-2 ), which activates STAT5 .
 CTLL-2, IL-2, beta-casein gene, interleukin-2, cytotoxic T cell line, beta-casein, STAT5
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:
 CTLL-2, IL-2, beta-casein gene, interleukin-2, cytotoxic T cell line, beta-casein, STAT5