EC 2.7.4.8 Recombinant from a prokaryote. In 3.2 M ammonium sulphate. Specific activity: 568.4 U/mg (25oC, pH 7.6). Contaminants: ATPase = 0.00021 %, myokinase = 0.052 %, NADH oxidase = 0.00003 %. Stable at 4oC for > 2 years.