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We have generated a second line of mice lacking a transcription factor thought to be a critical regulator of MHC class II gene expression , CIITA (for class II transactivator ).
 DNA: MHC class II gene; protein: transactivator; protein: CIITA; protein: transcription factor
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: MHC class II gene, transactivator, CIITA, transcription factor 
Answer:
 DNA: MHC class II gene; protein: transactivator; protein: CIITA; protein: transcription factor