Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) alpha-1 antitrypsin deficiency ?
    ### Response:
    Alpha-1 antitrypsin deficiency is an inherited disorder that may cause lung disease and liver disease. The signs and symptoms of the condition and the age at which they appear vary among individuals.  People with alpha-1 antitrypsin deficiency usually develop the first signs and symptoms of lung disease between ages 20 and 50.
    