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Locked nucleic acid ( LNA ) is a chemical modification which introduces a - O - CH2 - linkage in the furanose sugar of nucleic acids and blocks its conformation in a particular state .
 Chemical: O - CH2; Chemical: furanose sugar
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: O - CH2; Chemical: furanose sugar