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Polymersomes , vesicles composed of bilayer membranes of amphiphilic block - copolymers , are promising delivery vehicles for long - term storage and controlled release of bioactives ; enhanced stability of the membrane makes polymersomes potentially useful in a wide range of biological delivery applications by comparison with liposomes .
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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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