Lyophilised in vials containing approximately 5 mg dry wt. and at least 100 units/vial (20 to 40 units/mg dry wt.).

Unit definition: One unit hydrolyses 1 µmole of p-nitrophenyl thymidine-5-phosphate per minute at pH 8,9 and 25 °C

pH: optimum pH=9,8 to 10,4.5 (Lit.)