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On the other hand , MNPs showed only reversibly reduced cellular metabolic activity in concentrations up to 200 mu g / ml and , in the tested concentration the cell cycle distribution was within the normal range , indicating safety of the established magnetic carrier system for the treated cells .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None