Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Opitz G/BBB syndrome ?
    ### Response:
    Opitz G/BBB syndrome is a genetic condition that causes several abnormalities along the midline of the body. "G/BBB" represents the first letters of the last names of the families first diagnosed with this disorder and "Opitz" is the last name of the doctor who first described the signs and symptoms.
    