13722
Spinocerebellar ataxia type 3 ( SCA3 ) caused by polyglutamine - expanded ataxin - 3 is the most prevalent subtype of spinocerebellar ataxias .
 Chemical: polyglutamine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polyglutamine