28958
Lipopolysaccharides ( LPS ) make up approximately 75 % of the Gram - negative bacterial outer membrane ( OM ) surface , however , due to the complexity of the molecule , there are very few model OMs that include LPS .
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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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