30502
The results demonstrate that glycerol and urea can retain high steady state flux of Mz across skin membranes at dehydrating conditions , which otherwise would decrease the permeability due to dehydration .
 glycerol, urea
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 glycerol, urea