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Examination of CIITA mRNA in IK stably transfected clones revealed a marked reduction of CIITA mRNA transcription .
 CIITA mRNA, CIITA mRNA, IK, CIITA, 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:
 CIITA mRNA, CIITA mRNA, IK, CIITA, CIITA