2.8.3.9	-15°C 0.0062 mg/ml protein, 10 mM phosphate buffer, pH 7.0, half-life of 12 days when thawed and refrozen 5 times	
2.8.3.9	-15°C, 3.1 mg protein/ml, 20 mM potassium phosphate, pH 7.0, retains full activity during storage for 1 year	
2.8.3.9	4°C, 0.0062 mg/ml protein, 10 mM phosphate buffer, pH 7.0, half-life of about 7 days