2.3.1.110 -20°C, no loss of activity for 2 months in the presence of 2-mercaptoethanol 2.3.1.110 -80°C, no loss of activity for 4 months in the presence of 2-mercaptoethanol 2.3.1.110 4°C, 10% loss of activity within 7 days, concentrated enzyme 2.3.1.110 4°C, as ammonium sulfate paste, 10 mM mercaptoethanol, 24 h, 25% loss of activity 2.3.1.110 4°C, as ammonium sulfate paste, 5 mM DTT, 10% loss of activity within 24 h 2.3.1.110 4°C, no loss of activity for 14 days in the presence of 2-mercaptoethanol 2.3.1.110 4°C, purified recombinant GST-tagged AAT1, in 50 mM Tris-Cl, pH 8.0, and 10 mM reduced glutathione, 4 weeks, stable