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To overcome these shortcomings , nanotechnology has offered new promising strategies to prevent and treat a wide variety of diseases by employing different oral drug - carrier structures capable to enhance therapeutic effects and minimize the toxicity of healthy organs or 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:
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