Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Aromatic L-amino acid decarboxylase deficiency ?
    ### Response:
    Aromatic l-amino acid decarboxylase (AADC) deficiency is an inherited condition that affects the way signals are passed between certain cells in the nervous system. Individuals affected by this condition often have severe movement disorders, abnormal eye movements, autonomic symptoms, and neurological impairment.
    