Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) 22q11.2 deletion syndrome ?
    ### Response:
    22q11.2 deletion syndrome (which is also known by several other names, listed below) is a disorder caused by the deletion of a small piece of chromosome 22. The deletion occurs near the middle of the chromosome at a location designated q11.2.  22q11.2 deletion syndrome has many possible signs and symptoms that can affect almost any part of the body.
    