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al·pha-1-an·ti·tryp·sin | \ -ˌwən-ˌant-i-ˈtrip-sən, -ˌan-ˌtī- 
\
\Medical Definition of alpha-1-antitrypsin
: a trypsin-inhibiting serum protein which inhibits the digestive action of elastase on the tissues of the lungs and whose deficiency is associated with the development of emphysema
—abbreviation AAT
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