EC 2.7.4.3 Recombinant from a prokaryote. 

In 3.2 M ammonium sulphate.

 Specific activity: 1496 U/mg (25oC, pH 7.6). 

Contaminants: ATPase, lactate dehydrogenase, NADH oxidase, phosphoglycerate kinase, pyruvate kinase < 0.001 %. 

Stable at 4oC for > 2 years.