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The class II trans-activator ( CIITA ) is a bi- or multi-functional domain protein which plays a critical role in the expression of MHC class II genes .
 CIITA, MHC class II genes, class II trans-activator, bi- or multi-functional domain 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:
 CIITA, MHC class II genes, class II trans-activator, bi- or multi-functional domain protein