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The class II transactivator CIITA is required for transcriptional activation of the major histocompatibility complex (MHC) class II genes .
 class II transactivator, major histocompatibility complex (MHC) class II genes, CIITA
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:
 class II transactivator, major histocompatibility complex (MHC) class II genes, CIITA