1.3.98.1 -20°C, 4 months 1.3.98.1 -20°C, 50% glycerol 1.3.98.1 -20°C, 50% glycerol, several months, without loss of activity 1.3.98.1 -20°C, 50% glycerol, stable for several months 1.3.98.1 -20°C, progressive enzyme decay 1.3.98.1 -78°C, indefinitely stable 1.3.98.1 0°C, 1 week 1.3.98.1 4°C, 10% loss of activity per day, full activity restored by addition of 0.1 mM 2-mercaptoethanol or dithiothreitol 1.3.98.1 4°C, pH 7.8, 0.05 M sodium phosphate buffer, 0.1% Triton X-100 1.3.98.1 4°C, purified enzyme, stable up to two years