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The increased TNF - alpha production was dependent on cell - to - cell contact because when the two cell types were separated in trans - wells , no stimulation was observed ( Fig . 2 B ) .
 cell, cell, cell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 cell, cell, cell