Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Nager syndrome ?
    ### Response:
    Nager syndrome is a rare condition that mainly affects the development of the face, hands, and arms. The severity of this disorder varies among affected individuals.  Children with Nager syndrome are born with underdeveloped cheek bones (malar hypoplasia) and a very small lower jaw (micrognathia).
    