14123
There was a large artifact band in immunoblots of whole skin homogenates that interfered with detection of covalent binding ; however , when the skin was separated into dermal and epidermal fractions , covalent binding was clearly present in the epidermis , which is also the location of sulfotransferases .
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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