13192
Results and discussion : The size of drug - loaded NPs ( drug polymer ratio 1 : 1 ) was found to be 89 . 67 +/- 6 . 43 nm .
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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