Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Citrullinemia type I ?
    ### Response:
    Citrullinemia type I is an inherited disorder that causes ammonia and other toxic substances to accumulate in the blood. This condition, also known as classic citrullinemia, belongs to a class of genetic diseases called urea cycle disorders. In most cases, the condition becomes evident in the first few days of life.
    