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These serum - resistant and thermostable VSV - G variants may aid the application of retroviral and lentiviral vectors to gene therapy . Gene Therapy advance online publication , 31 January 2013 ; doi : 10 . 1038 / gt . 2013 . 1 .
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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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