Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) 7q11.23 duplication syndrome ?
    ### Response:
    7q11.23 duplication syndrome is a condition that can cause a variety of neurological and behavioral problems as well as other abnormalities.  People with 7q11.23 duplication syndrome typically have delayed development of speech and delayed motor skills such as crawling and walking.
    