ammonium sulfate suspension, 100-300 units/mg protein (biuret)

lyophilized powder, recombinant, expressed in E. coli, ≥90% (SDS-PAGE)

Type I, lyophilized powder, ≥1.0 units/mg protein

lyophilized powder, ≥300 units/g solid

buffered aqueous solution, ≥10 units/mg protein, recombinant, expressed in E. coli

ammonium sulfate suspension, >25 units/mg protein (Bradford)

vial of ≥0.5 unit

lyophilized, ~9 U/mg