Additions

Specific activity, U/ mg protein

No additions

0

2.5 mM Mg²⁺

200 ± 5

2.5 mM Mg²⁺, 200 mM NH₄⁺

250 ± 10

2.5 mM Mg²⁺, 200 mM NH₄⁺, 1 mM EDTA

398 ± 2

0.1 mM Co²⁺

346 ± 3

0.1 mM Co²⁺, 200 mM NH₄⁺

448 ± 5