14765
Analysis of a number of combined mutants revealed that VSV - G harboring T230N + T368A or K66T + S162T + T230N + T368A mutations exhibited both higher in vitro resistance to human serum and higher thermostability , as well as enhanced resistance to rabbit and mouse serum .
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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:
 None