Glutathione Reductase from baker's yeast (S. cerevisiae), ammonium sulfate suspension, 100-300 units/mg protein (biuret)

L-Lactic Dehydrogenase from rabbit muscle, Type II, ammonium sulfate suspension, 800-1,200 units/mg protein

Peroxidase from horseradish, Type II, essentially salt-free, lyophilized powder, 150-250 units/mg solid (using pyrogallol)

Ribonuclease Inhibitor, recombinant, expressed in E. coli, 20-40 units/muL