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Using a HeLa cell line in which the expression of HFE is controlled by tetracycline , we show that the expression of HFE reduces 55Fe uptake from Tf by 33 % but does not affect the endocytic or exocytic rates of TfR cycling .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 None