474
The third section of the literature is devoted , more particularly , to nanocarriers developed for oral absorption in the past few years , including the behavior of nanovehicles upon oral administration with respect to membrane permeability , retention properties and stability , as well as methods which may lengthen residence time in the GI environment or improve drug absorption .
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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