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A mouse model for FHC has been widely used to study the mechanochemical properties of mutated cardiac myosin , but mouse hearts express alpha - MHC , whereas the ventricles of larger mammals express predominantly beta - MHC .
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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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