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The HEL cells also exhibited a similar elevation of AhR mRNA level , when they had differentiated toward monocyte-macrophage cells by these combined inducers, but little change in the mRNA level was observed when the cells were induced to differentiate into other cell types.
 monocyte-macrophage cells, HEL cells, AhR, AhR mRNA
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:
 monocyte-macrophage cells, HEL cells, AhR, AhR mRNA