Alpha-1 antitrypsin (AAT) is a liver protein that blocks the destructive effects of certain enzymes. AAT deficiency results from a genetic defect and can cause liver disease and emphysema. For example, approximately 75% of adults with a severe AAT deficiency will develop emphysema, which often begins before 40 years of age. Smoking can further increase this risk.
Swiss-Prot Accession Number: P01009
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