13066
Measles virus ( MV ) , an enveloped RNA virus belonging to the Paramyxoviridae family , enters the cell through membrane fusion mediated by two viral envelope proteins , an attachment protein hemagglutinin ( H ) and a fusion ( 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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