Alpha-1 antitrypsin deficiency awareness lapel pins are an ideal way to show your support and promote awareness. Gray is the awareness color for Alpha-1 antitrypsin deficiency and November is the awareness month. Alpha-1 antitrypsin deficiency (AAT deficiency) is an inherited condition that raises your risk for lung and liver disease. Alpha-1 antitrypsin (AAT) is a protein that protects the lungs. The liver makes it. If the AAT proteins aren't the right shape, they get stuck in the liver cells and can't reach the lungs.