1782
Thus , a tertiary structural model of human GALNS was constructed from the X - ray crystal structure of N - acetylgalacto - samine - 4 - sulfatase and arylsulfatase A , using homology modeling , and 32 missense mutations were investigated .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 None