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In this study it is tested whether the activation of the C system by PEG - liposomes could be significantly reduced to values comparable to nonreactive liposomal formulations , by changing the PEGylation - profile on the liposomal surface .
 Chemical: PEG
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PEG