Thesis statement + sources
Thesis statement:
Reasons for why there is no cure for rare disease.
The most crucial reason is because it costs a lot but not that common used and because of only few people need,it not profitable...so,no company is willing to invest this
SOURCES:
https://en.wikipedia.org/wiki/Albinism
http://www.baike.com/wiki/%E4%BA%A8%E5%BB%B7%E9%A1%BF%E7%97%85
https://en.wikipedia.org/wiki/Mitochondrial_disease
