Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) isolated growth hormone deficiency ?
    ### Response:
    Isolated growth hormone deficiency is a condition caused by a severe shortage or absence of growth hormone. Growth hormone is a protein that is necessary for the normal growth of the body's bones and tissues. Because they do not have enough of this hormone, people with isolated growth hormone deficiency commonly experience a failure to grow at the expected rate and have unusually short stature.
    