Glucose-6-phosphate Dehydrogenase from Leuconostoc mesenteroides, Type XXIII, ammonium sulfate suspension, 550-1,100 units/mg protein (biuret), >=2.0 mg/mL Biuret

3-Phosphoglyceric Phosphokinase from baker's yeast (S. cerevisiae), ammonium sulfate suspension, >=500 units/mg protein

Peroxidase from horseradish, Type VI, essentially salt-free, lyophilized powder, >=250 units/mg solid (using pyrogallol)

Acetylcholinesterase from Electrophorus electricus (electric eel), Type VI-S, lyophilized powder, 200-1,000 units/mg protein