20144
Moreover , another relevant development of NPs surface engineering was achieved by conjugating to the surface of g7 - NPs , some specific and selective antibodies to drive NPs directly to a specific cell type once inside the CNS parenchyma .
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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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