28770
In addition , the surface carboxy groups on the PSQ - 2 particles can be modified with polyethylene glycol ( PEG ) and the anisamide ( AA ) ligand to enhance biocompatibility and cell uptake , respectively .
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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:
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