13067
The crystal structure of the receptor - binding head domain of MV - H bound to its cellular receptor revealed that the MV - H head domain forms a tetrameric assembly ( dimer of dimers ) , which occurs in two forms ( forms I and II ) .
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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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