2.7.7.15 -20°C stable for several months in 50% glycerol/20 mM Tris pH 7.5 2.7.7.15 -20°C, enzyme concentrated to a small volume, 50% glycerol, 20% loss of activity after 2 weeks 2.7.7.15 -20°C, stable for at least 8 months in 70% ammonium sulfate 2.7.7.15 -20°C, stable for more than 1 month in presence of 20% glycerol 2.7.7.15 -70°C, 50 mM Tris-HCl, 150 mM NaCl, 1.0 mM EDTA, 2.0 mM DTT, 0.025% NaN3, pH 7.4, 0.03% Triton X-100, 200 mM phosphate, stable for several months 2.7.7.15 -70°C, stable in presence of Triton X-100 and 0.2 M potassium phosphate 2.7.7.15 0°C, 80% loss of activity after 6 days 2.7.7.15 4°C, 20% loss of activity per day 2.7.7.15 4°C, 30% loss of activity after 1 week 2.7.7.15 4°C, increase of activity in fresh cytosol obtained by storage is due to an increase of lysophosphatidylethanolamine and a decrease in phosphatidylethanolamine