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Finally , a comparison of the skin permeation of the nanoemulsion versus only the surfactant excipients resulted in a steady state flux of 23 . 44 mu g / cm ( 2 ) / h for the nanoemulsion as opposed to 6 . 10 mu g / cm ( 2 ) / h for the emulsifiers .
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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