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The vector originality is based on the fact that , in addition to the siRNA molecule , it contains two components : 1 ) a cationic liposome that auto - associates with the siRNA to form particles called " lipoplexes " and , 2 ) an anionic polymer which enhances the lipoplex ' s efficiency .
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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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