3686
The reduction in skin concentration after dermal application in mdr1a / 1b / bcrp - / - mice was greater in the dermis than in the epidermis , suggesting functional expressions of these transporters in two distinct skin compartments .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None