Type II, ≥15,000 units/g solid (without added oxygen)
Type X-S, lyophilized powder, 100,000-250,000 units/g solid (without added oxygen)
recombinant, expressed in, lyophilized powder, ≥10 units/mg protein
aqueous solution, ≥30 units/mg protein (biuret)
lyophilized powder, ≥20 units/mg protein
lyophilized powder, ≥50 units/mg protein, recombinant, expressed in E. coli
lyophilized powder, ≥3,000 units/g solid
500-1,500 units/mg protein