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Detailed investigation of the subcellular localization of SLNs and the evidence for their transfer and distribution via TNTs to the cells , which are not in direct contact with the source of SLNs , are important for understanding the mechanism of targeted drug delivery .
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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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