2.4.1.40	-20°C, rapid loss of activity	
2.4.1.40	-60°C, 2 mM MnCl2, 1 mM EDTA, 0.02 mM UDP, stable for up to 30 days	
2.4.1.40	-70°C, 0.025 M MES buffer, pH 6.0, 1 mM EDTA, 0.03% Triton X-100, after removal of most of the buffer by dialysis, stable for 1 year	
2.4.1.40	-80°C, 20% loss of activity after 1 year	
2.4.1.40	4°C, 0.05 M Tris-HCl, pH 7.4, 2 mM MnCl2, 1 mM EDTA, 0.01% w/v Triton X-100, 0.2 M NaCl, 1 mM dithiothreitol, 0.03% w/v NaN3, 10% loss of activity per month	
2.4.1.40	4°C, 25% loss of activity after storage of plasma for 2 weeks	
2.4.1.40	4°C, pH 7.5, half-life is about 3 months	
2.4.1.40	4°C, rapid loss of activity of purified enzyme