23334
The discovery in 1990 that a point mutation at residue 403 ( R403Q ) in the beta - myosin heavy chain ( MHC ) caused a severe form of FHC was the first of many demonstrations linking FHC to mutations in muscle proteins .
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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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