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To examine transcriptional regulation of cytokine genes by CD15 engagement, a CAT plasmid reporter construct containing IL-1 beta promoter/enhancer sequences was introduced into MM6 .
 MM6, cytokine genes, IL-1 beta promoter/enhancer sequences, IL-1 beta
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:
 MM6, cytokine genes, IL-1 beta promoter/enhancer sequences, IL-1 beta