EC 2.7.4.9 Recombinant from a prokaryote. In 3.2 M ammonium sulphate. Specific activity: 3.8 U/mg (25oC, pH 7.6). Contaminants: ATPase = 0.013 %, myokinase = 0.088 %, NADH oxidase = 0.0069 %. Stable at 4oC for > 2 years.