Drug candidate fails to improve symptoms of fragile X syndrome
![fragile X mutation](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/01/ticker_ss_fragilex_free.jpg?fit=860%2C460&ssl=1)
A mutation on the X chromosome, above, causes fragile X syndrome, which can cause intellectual disabilities and autism spectrum disorders. An experimental drug for treating the syndrome has proven ineffective in clinical trials.
CDC