547
The short variant of the polymorphism reduces the transcriptional efficiency of the 5 - HTT gene promoter , resulting in decreased 5 - HTT expression and 5 - HT uptake in lymphoblasts .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 None