11472
Since the CTL response to virus infection is often focused on one or a few immunodominant epitopes , one approach to circumvent this response is to create vectors that lack these immunodominant epitopes .
 immunodominant epitopes, CTL, immunodominant epitopes
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:
 immunodominant epitopes, CTL, immunodominant epitopes