Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) fragile XE syndrome ?
    ### Response:
    Fragile XE syndrome is a genetic disorder that impairs thinking ability and cognitive functioning. Most affected individuals have mild intellectual disability. In some people with this condition, cognitive function is described as borderline, which means that it is below average but not low enough to be classified as an intellectual disability.
    