13068
In this study , we show that mutations in the putative dimer - dimer interface of the head domain in either form inhibit the ability of MV - H to support membrane fusion , without greatly affecting its cell surface expression , receptor binding , and interaction with the F protein .
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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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