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Similar to our previous results with activated NK cells ( Figs . 2 and 3 ) , addition of NK cells to the culture leads to opposing effects on the iDC population depending on the NK / DC ratio .
 NK cells, NK cells, culture, iDC, NK, DC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 NK cells, NK cells, culture, iDC, NK, DC