3.Huntington disease(HD) is neurodegenerative genetic disorder that affects muscle coordination. It caused by autosomal dominant mutation in Huntingtin gene and accumulates Huntington protein. This protein plays an important role in nerve cells. It upregulates Brain Derived Neurotrophic Factor (BDNF) and essential for development. It is associated with vesicles and microtubules and involved in vesicle trafficking. It also interact with over 100 other protein. However, less investigation focuses this protein on pain sensory level. Under the cooperation of Dr. Yang, the investigators will investigate the over-expression Huntington protein mice that will induce Huntington disease. The investigators will work on this issue and deepen our finding and produce a new view for this old disease.