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Finally , by chemical cross - linking of surface proteins in living cells and cell killing assay using a pore - forming bacterial toxin , we showed that enhanced oligomerization by GPI - remodeling occurs under a physiological membrane environment .
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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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