Fragile X syndrome, or FXS, is the most common inherited cause of intellectual disability in the U.S. Each year, thousands of people are diagnosed with the condition. Many patients’ families may be told their child will have the…

Fragile X syndrome, or FXS, is the most common inherited cause of intellectual disability in the U.S. Each year, thousands of people are diagnosed with the condition. Many patients’ families may be told their child will have the…