Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) molybdenum cofactor deficiency ?
    ### Response:
    Molybdenum cofactor deficiency is a rare condition characterized by brain dysfunction (encephalopathy) that worsens over time. Babies with this condition appear normal at birth, but within a week they have difficulty feeding and develop seizures that do not improve with treatment (intractable seizures).
    