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( B ) Contact - dependent stimulation of iDC TNF - alpha production by NK cells was tested under the following conditions : DCs alone ( gray bars ) ; NK + DC ( 1 : 5 ) ( black bars ) ; NK / DC ( 1 : 5 ) trans - wells ( striped bars ) .
 iDC, NK cells, DCs, NK, DC, NK, DC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 iDC, NK cells, DCs, NK, DC, NK, DC