Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Baller-Gerold syndrome ?
    ### Response:
    Baller-Gerold syndrome is a rare condition characterized by the premature fusion of certain skull bones (craniosynostosis) and abnormalities of bones in the arms and hands, sometimes referred to as radial ray anomalies. Many cases of Baller-Gerold syndrome are caused by mutations in the RECQL4 gene.
    