2117
SGSH , GALNS and ARSB mutations are usually missense ( 76 . 5 % , 81 . 8 % and 85 % ) , while IDUA has many more nonsense mutations ( 56 % ) than the other genes ( <= 20 % ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None