Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) 22q11.2 duplication ?
    ### Response:
    22q11.2 duplication is a condition caused by an extra copy of a small piece of chromosome 22. The duplication occurs near the middle of the chromosome at a location designated q11.2.  The features of this condition vary widely, even among members of the same family.
    