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Myotonic dystrophy type 1 ( DM1 ) is caused by an expanded CUG repeat ( CUG ( exp ) ) that sequesters muscleblind - like 1 protein ( MBNL1 ) , a protein that regulates alternative splicing .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None